Differential Responses of Soil Organic Carbon Fractions and Carbon Turnover Related Enzyme Activities to Wheat Straw Incorporation in Subtropical China
作者机构：School of Agriculture and BiologyShanghai Jiaotong UniversityShanghai200240China Department of MicrobiologyCollege of ResourcesSichuan Agricultural UniversityChengdu611130China
出 版 物：《Phyton-International Journal of Experimental Botany》 (国际实验植物学杂志（英文）)
年 卷 期：2022年第91卷第1期
页 面：169-183页
核心收录：
学科分类：0710[理学-生物学] 1002[医学-临床医学] 1001[医学-基础医学(可授医学、理学学位)] 09[农学] 0903[农学-农业资源与环境] 0901[农学-作物学] 0703[理学-化学] 0902[农学-园艺学] 090301[农学-土壤学]
基 金：This work was funded by the Shanghai Agriculture Applied Technology Development Program,China(Grant No.G20190308) the National Key Research and Development Program of China(2016YFD0801106)
主 题：Wheat straw incorporation soil organic carbon fractions soil carbon turnover related enzymes paddy soil subtropical China
摘 要：Soil organic carbon(SOC)fractions and C turnover related enzyme activities are essential for nutrient *** is because they are regarded as important indicators of soil fertility and *** measured the effects of wheat straw incorporation on SOC fractions and C turnover related enzyme activities in a paddy field in subtropical *** samples were collected from 0-10 cm and 10-20 cm depths after rice *** total SOC concentrations were higher in the high rate of wheat straw incorporation treatment(NPKS2)than in the not fertilized control(CK)(P0.05).The concentrations of labile C fractions[i.e.,water soluble organic C(WSOC),hot-water soluble organic C(HWSOC),microbial biomass C(MBC),and easily oxidizable C(EOC)],were higher in the moderate NPKS1 and NPKS2 treatments than in CK and the fertilized treatment without straw(NPK)(P0.05).The geometric means of labile C(GMC)and C pool management index(CPMI)values were highest in NPKS2(P0.05).The SOC concentrations correlated positively with the labile C fractions(P0.05).Soil cellulase activity and the geometric mean of enzyme activities(GMea)were higher in NPKS2 than in CK in all soil layers(P0.05),and the invertase activity was higher in NPKS2 than in CK in the 0-10 cm layer(P0.05).Stepwise multiple linear regression indicated that the formation of the SOC,WSOC,HWSOC,MBC,and EOC was mostly enhanced by the cellulase and invertase activities(P0.05).Therefore,the high rate of wheat straw incorporation may be recommended to increase soil C pool levels and soil fertility in subtropical paddy soils.
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