A soil texture manipulation doubled the priming effect following crop straw addition as estimated by

删除或更新信息，请邮件至freekaoyan#163.com(#换成@)

本站小编 Free考研考试/2020-03-20

论文编号:
论文题目:	A soil texture manipulation doubled the priming effect following crop straw addition as estimated by two models
英文论文题目:	A soil texture manipulation doubled the priming effect following crop straw addition as estimated by two models
第一作者:	Xu, Yuzhi
英文第一作者:	Xu, Yuzhi
联系作者:	Zhang, Bin
英文联系作者:	Zhang, Bin
外单位作者单位:
英文外单位作者单位:
发表年度:	2019
卷:	186
期:
页码:	11-22
摘要:	Crop straw is often incorporated with soil tillage to maintain soil organic carbon (SOC). Both the crop straw additionper seand its associated soil structure changes can stimulate SOC decomposition, known as the priming effect. Yet no attempt has been made to isolate their effects. In addition, the priming effect is usually estimated by using uniformly labeled plant litters in the laboratory, and the impacts of non-uniform labeling on the estimation of the priming are poorly understood. The objectives of this study were 1) to isolate the effects of crop straw addition and soil structure changes on SOC decomposition and microbial community composition and 2) to evaluate the effects of the addition of pulse-labeled straw on estimation of the priming effects. The labeled13C content and its δ13C abundance in the labile fractions of the straw sequentially extracted by ethanol, water and 0.1？M HCl were similar, but were much larger than those in the stable fractions exacted by 0.1？M NaOH. To identify the effects of soil structure changes, the soil texture of a surface soil was manipulated by adding fine sized particles (<53？μm from the subsoil) into the soil. After straw addition, >74？μm macroporosity of the texture-manipulated soil (MMS1) increased, causing strong shifts in microbial community composition characterized by phosphorus lipid fatty acid profiling compared to non manipulated soil (NMS1) during a 56-day incubation. The dynamics and total priming effects estimated using the end mixing model (EMM) based on the δ13C abundance in the labeled straw and the improved priming model (PRIM) based on first-order SOC decomposition agree well. Total straw decomposition and total priming effect in the treatment MMS1were larger than those in the treatment NMS1by 175% and 170% with the EMM model, respectively. Our findings highlight the importance of understanding abiotic and biotic interactions underlying SOC turnover in the detritusphere of arable ecosystems.
英文摘要:	Crop straw is often incorporated with soil tillage to maintain soil organic carbon (SOC). Both the crop straw additionper seand its associated soil structure changes can stimulate SOC decomposition, known as the priming effect. Yet no attempt has been made to isolate their effects. In addition, the priming effect is usually estimated by using uniformly labeled plant litters in the laboratory, and the impacts of non-uniform labeling on the estimation of the priming are poorly understood. The objectives of this study were 1) to isolate the effects of crop straw addition and soil structure changes on SOC decomposition and microbial community composition and 2) to evaluate the effects of the addition of pulse-labeled straw on estimation of the priming effects. The labeled13C content and its δ13C abundance in the labile fractions of the straw sequentially extracted by ethanol, water and 0.1？M HCl were similar, but were much larger than those in the stable fractions exacted by 0.1？M NaOH. To identify the effects of soil structure changes, the soil texture of a surface soil was manipulated by adding fine sized particles (<53？μm from the subsoil) into the soil. After straw addition, >74？μm macroporosity of the texture-manipulated soil (MMS1) increased, causing strong shifts in microbial community composition characterized by phosphorus lipid fatty acid profiling compared to non manipulated soil (NMS1) during a 56-day incubation. The dynamics and total priming effects estimated using the end mixing model (EMM) based on the δ13C abundance in the labeled straw and the improved priming model (PRIM) based on first-order SOC decomposition agree well. Total straw decomposition and total priming effect in the treatment MMS1were larger than those in the treatment NMS1by 175% and 170% with the EMM model, respectively. Our findings highlight the importance of understanding abiotic and biotic interactions underlying SOC turnover in the detritusphere of arable ecosystems.
刊物名称:	Soil & Tillage Research
英文刊物名称:	Soil & Tillage Research
论文全文:
英文论文全文:
全文链接:
其它备注:
英文其它备注:
学科:
英文学科:
影响因子:
第一作者所在部门:
英文第一作者所在部门:
论文出处:
英文论文出处:
论文类别:
英文论文类别:
参与作者:	Y. Z. Xu, K. Liu, Y. Han, H. Jiang, S. H. Yao and B. Zhang
英文参与作者:	Y. Z. Xu, K. Liu, Y. Han, H. Jiang, S. H. Yao and B. Zhang

A soil texture manipulation doubled the priming effect following crop straw addition as estimated by

本站小编 Free考研考试/2020-03-20

相关话题/texture manipulation doubled

领限时大额优惠券,享本站正版考研考试资料!