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

盐碱地开垦优先提升植物源碳的积累以增加表层土壤碳储量

作　　者：Lin Chen Guixiang Zhou Biao Feng a Chao Wang Yu Luo Fang Li Congcong Shen Donghao Ma Congzhi Zhang Jiabao Zhang 陈林;周桂香;冯彪;王超;罗煜;李芳;申聪聪;马东豪;张丛志;张佳宝

机构地区：[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]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 Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China

出　　处：《Science Bulletin》2024年第18期2948-2958,共11页科学通报（英文版）

基　　金：supported by the National Key Research and Development Program of China (2022YFD1500203 and2022YFD1500401);the Strategic Priority Research Program of Chinese Academy of Sciences (XDA24020104 and XDA28020203);the National Natural Science Foundation of China (42177332,42177292, and 42277336);the China Agriculture Research System(CARS-03-15 and CARS-52);the Youth Innovation Promotion Association of Chinese Academy of Sciences (2023325)。

摘　　要：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 properties, 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 transformation 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.

关 键 词：Saline-alkali land Salt-affected soil Particulate organic carbon Mineral-associated organic carbon Plant-derived carbon 

分 类 号：X144[环境科学与工程—环境科学]