Saline-alkali land reclamation boosts topsoil carbon storage by preferentially accumulating plant-derived carbon

Lin Chen ¹Guixiang Zhou ¹Biao Feng ²Chao Wang ³Yu Luo ⁴Fang Li ⁵Congcong Shen ⁶Donghao Ma ¹Congzhi Zhang ¹Jiabao Zhang²

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作者信息

1. State Key Laboratory of Soil and Sustainable Agriculture,Fengqiu Experimental Station of National Ecosystem Research Network of China,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 211135,China
2. State Key Laboratory of Soil and Sustainable Agriculture,Fengqiu Experimental Station of National Ecosystem Research Network of China,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 211135,China;University of Chinese Academy of Sciences,Beijing 100049,China
3. CAS Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China
4. Institute of Soil and Water Resources and Environmental Science,Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment,Zhejiang University,Hangzhou 310058,China
5. College of Resources and Environment,Henan Agricultural University,Zhengzhou 450002,China
6. State Key Laboratory of Urban and Regional Ecolo-gy,Research Center for Eco-environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China
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Abstract

Saline-alkali land is an important cultivated land reserve resource for tackling global climate change and ensuring food security,partly because it can store large amounts of carbon(C).However,it is unclear how saline-alkali land reclamation(converting saline-alkali land into cultivated land)affects soil C storage.We collected 189 adjacent pairs of salt-affected and cultivated soil samples(0-30 cm deep)from the Songnen Plain,eastern coastal area,Hetao Plain,and northwestern arid area in China.Various soil prop-erties,the soil inorganic C(SIC),organic C(SOC),particulate organic C(POC),and mineral-associated organic C(MAOC)densities,and plant-and microbial-derived C accumulation were determined.Saline-alkali land reclamation inconsistently affected the SIC density but significantly(P＜0.001)increased the SOC density.The SOC,POC,and MAOC densities were predicted well by the integrative soil amelioration index.Saline-alkali land reclamation significantly increased plant-derived C accumulation and the plant-derived C to microbial-derived C ratios in all saline-alkali areas,and less microbial trans-formation of plant-derived C(i.e.,less lignin degradation or oxidation)occurred in cultivated soils than salt-affected soils.The results indicated that saline-alkali land reclamation leads to plant-derived C becoming the dominant contributor of SOC storage.POC storage and MAOC storage were strongly linked to plant-and microbial-derived C accumulation,respectively,caused by saline-alkali land reclamation.Our findings suggest that saline-alkali land reclamation increases C storage in topsoil by preferentially promoting plant-derived C accumulation.

Key words

Saline-alkali land/Salt-affected soil/Particulate organic carbon/Mineral-associated organic carbon/Plant-derived carbon

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基金项目

National Key Research and Development Program of China(2022YFD1500203)

National Key Research and Development Program of China(2022YFD1500401)

Strategic Priority Research Program of Chinese Academy of Sciences(XDA24020104)

Strategic Priority Research Program of Chinese Academy of Sciences(XDA28020203)

National Natural Science Foundation of China(42177332)

National Natural Science Foundation of China(42177292)

National Natural Science Foundation of China(42277336)

China Agriculture Research System(CARS-03-15)

China Agriculture Research System(CARS-52)

Youth Innovation Promotion Association of Chinese Academy of Sciences(2023325)

出版年

2024

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

参考文献量4

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