References

1. Reichstein M, Bahn M, Ciais P, Frank D, Mahecha MD, et al (2013) Climate extremes and the carbon cycle. Nature 500: 287-295. [CrossRef] [Google Scholar]
2. Lal R (2004) Soil carbon sequestration to mitigate climate change. Geoderma 123: 1-22. [CrossRef] [Google Scholar]
3. Lal R (2010) Managing soils and ecosystems for mitigating anthropogenic carbon emissions and advancing global food security. BioScience 60: 708-721. [CrossRef] [Google Scholar]
4. Lan GY, Liu C, Wang H, Tang W, Wu X, et al. (2021) The effect of land use change and soil redistribution on soil organic carbon dynamics in karst graben basin of China. Journal of Soils and Sediments. [CrossRef] [Google Scholar]
5. Liu C, Li ZW, Chang X, He, J, Nie X, et al. (2018) Soil carbon and nitrogen sources and redistribution as affected by erosion and deposition processes: a case study in a loess hilly-gully catchment, China. Agriculture Ecosystem Environment 253: 11-22. [CrossRef] [Google Scholar]
6. Wang K, Zhang C, Chen H, Yue Y, Zhang W, et al. (2019) Karst landscapes of China: patterns, ecosystem processes and services. Landscape Ecol 34: 2743-2763. [CrossRef] [Google Scholar]
7. Feng T, Chen H, Polyakov VO (2016) Soil erosion rates in two karst peak-cluster depression basins of northwest Guangxi, China: Comparison of the RUSLE model with 137Cs measurements. Geomorphology 253: 217-224. [CrossRef] [Google Scholar]
8. Song C, Ji H, Beckford H, Chang C, Wang S, et al. (2019) Assessment of chemical weathering and physical erosion along a hillslope, southwest China. Catena 182: 104133. [CrossRef] [Google Scholar]
9. Liu M, Han G, Zhang Q, Song Z (2019) Variations and Indications of δ13CSOC and δ15NSON in Soil Profiles in Karst Critical Zone Observatory (CZO), Southwest China. Sustainability 11: 2144. [CrossRef] [Google Scholar]
10. Peterson BJ, Fry B (1987) Stable isotopes in ecosystem studies. Annual Review of Ecology and Systematics 18: 293-320. [CrossRef] [Google Scholar]
11. Balesdent J, Mariotti A (1996) Measurement of soil organic matter turnover using 13C natural abundance. Mass spectrometry of soils. [Google Scholar]
12. Ehleringer JR, Buchmann N, Flanagan LB (2000) Carbon Isotope Ratios in Belowground Carbon Cycle Processes. Ecological Applications 10: 412-422. [CrossRef] [Google Scholar]
13. Gill R, Burke IC, Milchunas DG, Lauenroth WK (1999) Relationship between root biomass and soil organic matter pools in the short grass steppe of eastern Colorado. Ecosystems 2: 226-236. [CrossRef] [Google Scholar]
14. Poage MA, Feng X (2004) A theoretical analysis of steady state δ13C profiles of soil organic matter. Global Biogeochemical Cycle. [CrossRef] [Google Scholar]
15. Han GL, Li FS, Tang Y (2015) Variations in soil organic carbon contents and isotopic compositions under different land uses in a typical karst area in Southwest China. Geochemical Journal 49: 63-71. [CrossRef] [Google Scholar]
16. Li Q, Li ZY, Liang JH, He YY, Cao JH, et al. (2014) δ13C characteristics of soil organic carbon in hilly karst area. Polish Journal of Environmental Studies 23: 2345-2349. [Google Scholar]
17. Boutton TW (1991) Stable isotope ratios of natural materials: II. Atmospheric, terrestrial, marine, and freshwater environments. In: Coleman DC, Fry B. Carbon Isotope Techniques. New York: Academic Press.
18. Farquhar GD, Ehleringer JR, Hubick KT (1989) Carbon isotope discrimination and photosynthesis. Annual Review Plant Biology 40: 503-537. [CrossRef] [Google Scholar]
19. Krull ES, Skjemstad JO (2003) δ13C and δ15N profiles in 14C-dated Oxisol and Vertisols as a function of soil chemistry and mineralogy. Geoderma 112: 1-29. [CrossRef] [Google Scholar]
20. Feng X (2002) A theoretical analysis of carbon isotope evolution of decomposing plant litters and soil organic matter. Global Biogeochemical Cycle 16: 1119. [CrossRef] [Google Scholar]
21. Cai Y, Guo L, Wang X, Aiken G (2015) Abundance, stable isotopic composition, and export fluxes of DOC, POC, and DIC from the Lower Mississippi River during 2006-2008. Journal of Geophysical Research: Biogeosciences. [CrossRef] [Google Scholar]
22. Ramaswamy V, Gaye B, Shirodkar PV, Rao PS, Chivas AR, et al. (2008) Distribution and sources of organic carbon, nitrogen and their isotopic signatures in sediments from the Ayeyarwady (Irrawaddy) continental shelf, northern Andaman Sea. Marine Chemistry 111: 137-150. [CrossRef] [Google Scholar]
23. Zhang J, Wu Y, Jennerjahn TC, Ittekkot V, He Q, et al. (2007) Distribution of organic matter in the Chang jiang (Yangtze River) Estuary and their stable carbon and nitrogen isotopic ratios: implications for source discrimination and sedimentary dynamics. Marine Chemistry 106: 111-126. [CrossRef] [Google Scholar]
24. Yuan DX (1992) Karst in southwestern China and its comparison with karst in North China. Quaternary Research 4: 352-361. [Google Scholar]
25. Can JH, Yuan DX, Tong LQ (2008) Characteristics of karst ecosystem in southwest China and comprehensive control of rocky desertification. Grassland Science 25: 40-50. [CrossRef]
26. Huang J (2009) Yunnan stone forest karst mountain vegetation and soil degradation characteristics. Nanjing: Nanjing Forestry University.
27. Liu J (2015) Research on Karst area forest vegetation climate characteristics. Kunming: Yunnan Normal University.
28. Soil Survey Staff (2014) Keys to Soil Taxonomy, 12th ed.; USDA Natural Resources Conservation Service: Washington, DC, USA.
29. Midwood AJ, Boutton TW (1998) Soil carbonate decomposition by acid has little effect on δ13C of organic matter. Soil Biology and Biochemistry 30: 1301-1307. [CrossRef] [Google Scholar]
30. Meng L, DingW, Cai Z (2005) Long-term application of organic manure and nitrogen fertilizer on N2O emissions, soil quality and crop production in a sandy loam soil. Soil Biology Biochemistry 37: 2037-2045. [CrossRef] [Google Scholar]
31. Tuo DA, Gao G, Chang R, Li Z, Ma Y, et al. (2018) Effects of revegetation and precipitation gradient on soil carbon and nitrogen variations in deep profiles on the Loess Plateau of China. Sci Total Environ 626: 399-411. [CrossRef] [Google Scholar] [PubMed]
32. Chukwudi N, Okeke OJ, Fashae O, Nwankwoala H (2018) Soil organic carbon and total nitrogen stocks as affected by different land use in an Ultisol in Imo Watershed, southern Nigeria. Chemistry and Ecology. [CrossRef] [Google Scholar]
33. Li C, Li Y, Tang L (2010) Soil organic carbon stock and carbon efflux in deep soils of desert and oasis. Environmental Earth Sciences 60: 549-557. [CrossRef] [Google Scholar]
34. Wang Y, Li Y, Ye X, Chu Y, Wang X, et al. (2010) Profile storage of organic/inorganic carbon in soil: From forest to desert. Sci Total Environ 408: 1925-1931. [CrossRef] [Google Scholar] [PubMed]
35. Zhang J, Wang X, Wang J, Wang WX (2014) Carbon and Nitrogen Contents in Typical Plants and Soil Profiles in Yanqi Basin of Northwest China. Journal of Integrative Agriculture 13: 648-656. [CrossRef] [Google Scholar]
36. Han GL, Tang Y, Liu M, Zwieten LV, Yang X, et al. (2020) Carbon-nitrogen isotope coupling of soil organic matter in a karst region under land use change, Southwest China. Agriculture, Ecosystems and Environment 301: 107027. [CrossRef] [Google Scholar]
37. Xiong K, Yin C, Ji HB (2018) Soil erosion and chemical weathering in a region with typical karst topography. Environmental Earth Sciences 77: 500. [CrossRef] [Google Scholar]
38. Njeru CM, Ekesi S, Mohamed SA, Kinyamario JI, Kiboi S, et al. (2017) Assessing stock and thresholds detection of soil organic carbon and nitrogen along an altitude gradient in an east Africa mountain ecosystem. Geoderma Regional 10: 29-38. [CrossRef] [Google Scholar]
39. De Neve S, Hofman G (2000) Influence of soil compaction on carbon and nitrogen mineralization of soil organic matter and crop residues. Biology and Fertility of Soils 30: 544-549. [CrossRef] [Google Scholar]
40. Guillaume T, Damris M, Kuzyakov K (2015) Losses of soil carbon by converting tropical forest to plantations: erosion and decomposition estimated by δ13C. Global Change Biology 21: 3548-3560. [CrossRef] [Google Scholar]
41. Chen QQ, Shen CD, Sun YM, Peng SL (2005) Mechanism of distribution of soil organic matter with depth due to evolution of soil profiles at the Dinghushan Natural Reserve. Acta Pedol Sin 42: 1-8.
42. Chen QQ, Shen CD, Sun YM, Peng S, Yi W, et al. (2005) Spatial and temporal distribution of carbon isotopes in soil organic matter at the Dinghushan Biosphere Reserve, South China. Plant Soil 273: 115-128. [CrossRef] [Google Scholar]
43. Kalbitz K, Schwesig D, RethemeyerJ, Matzner E (2005) Stabilization of dissolves organic matter by sorption to the mineral soil. Soil Biology and Biochemistry 37: 1319-1331. [CrossRef] [Google Scholar]
44. Kalbitz K, Schwesig D, Rethemeyer J, Matzner E (2000) Controls on the dynamic of dissolved organic matter in soils: a review. Soil Science 165: 277-304. [Google Scholar]
45. Wynn JG, Harden JW, Fries TL (2006) Stable carbon isotope depth profiles and soil organic carbon dynamics in the lower Mississippi Basin. Geoderma 131: 89-109. [CrossRef] [Google Scholar]
46. Zhu SF, Liu CQ (2006) Vertical patterns of stable carbon isotope in soils and particle-size fractions of karst areas, Southwest China. Environmental Geology 50: 1119-1127. [CrossRef] [Google Scholar]
47. Podwojewski P, Poulenard J, Nguyet ML, de Rouw A, Nguyen VT, et al. (2011) Climate and vegetation determine soil organic matter status in an alpine inner-tropical soil catena in the Fan Si Pan Mountain, Vietnam. Catena 87: 226-239. [CrossRef] [Google Scholar]
48. Li XJ, Ogrinc N, Hamilton SK, Szramek K, Kanduc T, et al. (2009) Inorganic carbon isotope systematics in soil profiles undergoing silicate and carbonate weathering (Southern Michigan, USA). Chemical Geology 264: 139-153. [CrossRef] [Google Scholar]
49. Wang T, Kang F, Cheng X, Han H, Ji W, et al. (2016) Soil organic carbon and total nitrogen stocks under different land uses in a hilly ecological restoration area of north China. Soil and Tillage Research 163: 176-184. [CrossRef] [Google Scholar]
50. Don A, Schumacher J, Freibauer A (2011) Impact of tropical land-use change on soil organic carbon stocks - a meta-analysis. Global Change Biology 17: 1658-1670. [CrossRef] [Google Scholar]
51. Lal R (2001) Soil degradation by erosion. Land Degradation & Development 12: 519-539. [CrossRef] [Google Scholar]
52. Bai JH, DengW, Zhang YX (2001) Spatial distribution of nitrogen and phosphorus in soil of Momoge Wetland. Journal of Soil and Water Conservation 15: 79-81. [Google Scholar]
53. Diwediga B, Le QB, Agodzo S, Wala K (2017) Potential storages and drivers of soil organic carbon and total nitrogen across river basin landscape: the case of Mo River Basin (Togo) in West Africa. Ecological Engineering 99: 298-309. [CrossRef] [Google Scholar]
54. Gelaw AM, Singh BR, Lal R (2014) Soil organic carbon and total nitrogen stocks under different land uses in a semi-arid watershed in Tigray, northern Ethiopia. Agriculture Ecosystems and Environment 188: 256-263. [CrossRef] [Google Scholar]
55. Liu WG, Wang Z (2009) Nitrogen isotopic composition of plant-soil in the Loess Plateau and its responding to environmental change. Chinese Science Bulletin 54: 272-279. [CrossRef] [Google Scholar]
56. Jafari M, Kohande A, Baghbani S, Tavili A, Chahouki MAZ, et al. (2011) Comparison of chemical characteristics of shoot, root and litter in three range species of Salsola rigida, Artemisia sieberi and Stipa barbata. Caspian Journal Environment Science 9: 37-46. [Google Scholar]
57. Conen F, Zimmermann M, Leifeld J, Seth B, Alewell C, et al. (2008) Relative stability of soil carbon revealed by shifts in δ15N and C: N ratio. Biogeosciences 5: 123-128. [CrossRef] [Google Scholar]
58. Nadelhoffer KJ, Fry B (1994) Nitrogen isotope studies in forest ecosystems. Stable isotopes in ecology and environmental science.
59. Krull ES, Bestland EA, Skjemstad JO, Par JF (2006) Geochemistry (δ13C, δ15N, 13C NMR) and residence times (14C and OSL) of soil organic matter from red-brown earths of South Australia: Implications for soil genesis. Geoderma 132: 344-360. [CrossRef] [Google Scholar]
60. Goni MA, Teixeira MJ, Perkey DW (2003) Sources and distribution of organic matter in a river dominated estuary (Winyah Bay, SC, USA). Estuarine Coast Shelf Science 57: 1023-1048. [CrossRef] [Google Scholar]
61. Kendall C, Silva SR, Kelly VJ (2001) Carbon and nitrogen isotopic compositions of Particulate organic matter in four large river systems across the United States. Hydrological Processes 15: 1301-1346. [CrossRef] [Google Scholar]
62. Thorp JH, Delong MD, Greenwood KS, Casper AF (1998) Isotopic analysis of three food web theories in constricted and floodplain regions of a large river. Oecologia 117: 551-563. [CrossRef] [Google Scholar]
63. Landi A, Anderson DW, Mermut AR (2003) Organic carbon storage and stable isotope composition of soils along a grassland to forest environmental gradient in Saskatchewan. Canadian Journal of Soil Science 83: 405-414. [CrossRef] [Google Scholar]
64. Kelly EF, Amundson RG, Marino BD, DeNiro MJ (1991) Stable carbon isotopic composition of carbonate in Holocene grassland soils. Soil Science Society of American Journal 55: 1651-1658. [CrossRef] [Google Scholar]
65. Nel JA, Craine JM, Cramer MD (2018) Correspondence between δ13C and δ15N in soils suggests coordinated fractionation processes for soil C and N. Plant Soil 423: 1-15. [CrossRef] [Google Scholar]
66. Xiao HY, Liu CQ (2002) Sources of nitrogen and sulfur in wet deposition at Guiyang, Southwest China. Atmos Environ 36: 5121-5130. [CrossRef] [Google Scholar]
67. Stewart KJ, Grogan P, Coxson DS, Siciliano SD (2014) Topography as a key factor driving atmospheric nitrogen exchanges in arctic terrestrial ecosystems. Soil Biology and Biochemistry 70: 96-112. [CrossRef] [Google Scholar]
68. Hobbie EA, Hogberg P (2012) Nitrogen isotopes link mycorrhizal fungi and plants to nitrogen dynamics. New Phytologist 196: 367-382. [CrossRef] [Google Scholar]
69. Mariotti A (1983) Atmospheric nitrogen is a reliable standard for natural 15N abundance measurements. Nature 303: 685-687. [CrossRef] [Google Scholar]
70. Meyers PA (1994) Preservation of elemental and isotopic source identification of sedimentary organic matter. Chemical Geology 114: 289-302. [CrossRef] [Google Scholar]
71. Parton WJ, Schimel DS, Cole CV, Ojima DS (1987) Analysis of factors controlling soil organic matter levels in Great Plains grasslands. Soil Science Society of American Journal 51: 1173-1179. [CrossRef] [Google Scholar]
72. Tiessen J, Stewart JW, Hunt HW (1984) Concepts of soil organic matter transformation in relation to organo-mineral particle size fractions. Plant Soil 76: 287-295. [CrossRef] [Google Scholar]
73. Powers JS, Schlesinger WH (2002) Geographic and vertical patterns of stable carbon isotopes in tropical rain forest soils of Costa Rica. Geoderma 109: 141-160. [Google Scholar]
74. Garten CT, Cooper LW, Post WM, Hanson PJ (2000) Climate controls on forest soil C isotope ratios in the southern Appalachian Mountains. Ecology 81: 1108-1119. [CrossRef] [Google Scholar]
75. Ji-Suk P, Hee-Myong R (2018) Temporal Variations in Soil Profile Carbon and Nitrogen during Three Consecutive Years of 15N Deposition in Temperate Oak and Pine Forest Stands. Forests 9: 338. [CrossRef] [Google Scholar]
76. Powers JS, Schlesinger WH (2002) Relationships among soil carbon distributions and biophysical factors at nested spatial scales in rain forests of northeastern Costa Rica. Geoderma 109: 165-190. [CrossRef] [Google Scholar]
77. Awiti AO, Walsh MG, Kinyamario J (2008) Dynamics of topsoil carbon and nitrogen along a tropical forest cropland chronosequence: evidence from stable isotope analysis and spectroscopy. Agriculture Ecosystems and Environment 127: 265-272. [CrossRef] [Google Scholar]
78. Craine JM, Elmore AJ, Aidar MPM, Bustamante M, Dawson TE, et al (2010) Global patterns of foliar nitrogen isotopes and their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and nitrogen availability. New Phytologist 183: 980-992. [CrossRef] [Google Scholar]
79. Nadelhoffer KJ, Fry B (1988) Controls on natural Nitrogen 15 and Carbon 13 abundances in forest soil organic matter. Soil Science Society of American Journal 52: 1633-1640. [CrossRef] [Google Scholar]
80. Mariotti A, Pierre D, Vedy JC (1980) The abundance of natural nitrogen 15 in the organic matter of soils along an altitudinal gradient. Catena 7: 293-300. [CrossRef] [Google Scholar]
81. Steele K, Wilson A, Saunders W (1981) Nitrogen isotope ratios in surface and subsurface horizons of New Zealand improved grassland soils. New Zealand Journnal of Agricultural Research 24: 167-170. [CrossRef] [Google Scholar]
82. Ledgard S, Freney J, Simpson J (1984) Variations in natural enrichment of 15N in the profiles of some Australian pasture soils. Australian Journal of Soil Research 22: 155-164. [CrossRef] [Google Scholar]
83. Ostrom N, Knoke KE, Hedin LO, Robertson GP, Smucker AJM, et al. (1998) Temporal trends in nitrogen isotope values of nitrate leaching from an agricultural soil. Chemical Geology 146: 219-227. [CrossRef] [Google Scholar]
84. Tokumoto I, Heilman JL, Schwinning S, et al (2014) Small-scale variability in water storage and plant available water in shallow, rocky soils. Plant Soil 385: 193-204. [Google Scholar]
85. Acton P, Fox J, Campbell E, Rowe H, Wilkinson M, et al. (2013) Carbon isotope for estimating soil decomposition and physical mixing in well-drained forest soils. Journal of Geophysical Research: Biogeosciences 118: 1532-1545. [CrossRef] [Google Scholar]
86. McCorkle EP, Berhe AA, Carolyn T, Johnson DW, McFarlane KJ, et al. (2016) Tracing the source of soil organic matter eroded from temperate forest catchments using carbon and nitrogen isotopes. Chemical Geology 445: 172-184. [CrossRef] [Google Scholar]
87. Wang C, Lu X, Mori T, QingGong M, Kaijun Z, et al. (2018) Responses of soil microbial community to continuous experimental nitrogen additions for 13 years in a nitrogen-rich tropical forest. Soil Biology and Biochemistry 121: 103-112. [CrossRef] [Google Scholar]
88. Huon S, Grousset FE, Burdloff D, Bardoux G, Mariotti A, et al. (2002) Sources of fine-sized organic matter in North Atlantic Heinrich Layers: δ13C and δ15N tracers. Geochimica et Cosmochimica Acta 66: 223-239. [CrossRef] [Google Scholar]
89. Meyers PA, Takemura K (1997) Quaternary changes in delivery and accumulation of organic matter to sediments of Lake Biwa, Japan. Journal of Paleolimnology 18: 211-218. [CrossRef] [Google Scholar]