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秸秆连续还田配施化肥对稻-油轮作土壤碳库及作物产量的影响
摘要点击 517  全文点击 108  投稿时间:2021-12-04  修订日期:2022-02-03
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中文关键词  秸秆还田  不同土层  土壤总有机碳和组分  碳库管理指数  作物产量
英文关键词  straw returning  different soil layers  soil total organic carbon and fraction  carbon pool management index  crop yield
作者单位E-mail
蔡影 安徽农业大学资源与环境学院, 农田生态保育与污染防控安徽省重点实验室, 合肥 230036 yingcai1020@163.com 
付思伟 安徽农业大学资源与环境学院, 农田生态保育与污染防控安徽省重点实验室, 合肥 230036  
张博睿 安徽农业大学资源与环境学院, 农田生态保育与污染防控安徽省重点实验室, 合肥 230036  
胡宏祥 安徽农业大学资源与环境学院, 农田生态保育与污染防控安徽省重点实验室, 合肥 230036 hongxianghu@163.com 
刘文雯 安徽农业大学资源与环境学院, 农田生态保育与污染防控安徽省重点实验室, 合肥 230036  
俞金涛 安徽农业大学资源与环境学院, 农田生态保育与污染防控安徽省重点实验室, 合肥 230036  
贾临东 安徽农业大学资源与环境学院, 农田生态保育与污染防控安徽省重点实验室, 合肥 230036  
刘运峰 安徽农业大学资源与环境学院, 农田生态保育与污染防控安徽省重点实验室, 合肥 230036  
中文摘要
      依据田间连续7 a秸秆还田定位试验,探讨秸秆还田配施化肥对巢湖地区农田土壤剖面(0~20、20~50和50~80 cm)的土壤总有机碳(TOC)、可溶性有机碳(DOC)、颗粒有机碳(POC)、活性有机碳(LOC)、碳库管理指数(CPMI)和作物产量的影响.试验设置无秸秆还田+无施肥(CK)、常规施肥(F)、秸秆还田+常规施肥(SF1)和秸秆还田+80%常规施肥(SF2)这4个处理,分析不同土层土壤总有机碳和组分含量、CPMI和油菜-水稻产量的变化规律.结果表明,以CK为参考,常规施肥和秸秆还田配施化肥均提高了垂直剖面土壤总有机碳和组分的含量,且不同土层土壤总有机碳和组分的含量随土层深度增加而逐渐降低.在0~20 cm土层,与F处理相比,SF1和SF2处理显著提高TOC、DOC、POC和LOC的含量,增幅分别为:14.23%~28.97%、7.86%~27.01%、16.46%~24.24%和5.89%~6.64%(P<0.05);在20~50 cm土层,SF1较F处理的TOC和LOC的含量显著增加9.43%和8.34%(P<0.05),SF2较F处理的DOC和POC的含量显著增加17.51%和65.83%(P<0.05);在50~80 cm土层,各处理间土壤总有机碳和组分的含量均无显著差异.秸秆还田配施化肥对土壤碳库管理指数影响显著,SF1较F处理显著提高0~50 cm土层的CPMI,而F处理的CPMI在50~80 cm土层最大,但各处理间均无显著差异.秸秆还田配施化肥对作物产量具有显著提升作用,且SF1处理的产量最高,SF1较F处理的水稻、油菜和周年产量分别显著增加6.19%、7.67%和6.54%(P<0.05).总的来说,稻-油轮作模式下秸秆还田配施化肥对提高巢湖地区土壤碳库、土壤肥力和作物产量具有重要意义.
英文摘要
      According to the positioning experiment of straw returning in the continuous field 7a, the effects of straw returning combined with chemical fertilizer on soil total organic carbon (TOC), dissolved organic carbon (DOC), particulate organic carbon (POC), labile organic carbon (LOC), carbon pool management index (CPMI), and crop yield in farmland soil profiles (0-20, 20-50, and 50-80 cm) in the Chaohu Lake area were studied. There were four treatments:no straw returning+no fertilization (CK), conventional fertilization (F), straw returning+conventional fertilization (SF1), and straw returning+80% conventional fertilization (SF2). The changes in soil total organic carbon and component content, CPMI, and rape rice yield in different soil layers were analyzed. Taking CK as a reference, conventional fertilization and straw returning combined with chemical fertilizer increased the content of total organic carbon and components in the soil vertical profile, and the content of total organic carbon and components in different soil layers decreased gradually with the increase in soil depth. In the 0-20 cm soil layer, compared with that in the F treatment, the SF1 and SF2 treatments significantly increased the contents of TOC, DOC, POC, and LOC by 14.23%-28.97%, 7.86%-27.01%, 16.46%-24.24%, and 5.89%-6.64%, respectively (P<0.05). In the 20-50 cm soil layer, the contents of TOC and LOC in SF1 were significantly increased by 9.43% and 8.34%, respectively, compared with those in the F treatment (P<0.05), and the contents of DOC and POC in SF2 were significantly increased by 17.51% and 65.83% compared with those in the F treatment (P<0.05). In the 50-80 cm soil layer, there was no significant difference in the contents of total organic carbon and components among the treatments. The effect of straw returning and chemical fertilizer on the soil carbon pool management index was significant. SF1 significantly improved the CPMI of the 0-50 cm soil layer compared with that in the F treatment, whereas the CPMI of the F treatment was the largest in the 50-80 cm soil layer; however, there was no significant difference among all treatments. Straw returning combined with chemical fertilizer had a significant effect on crop yield, and the yield of the SF1 treatment was the highest; compared with that of the F treatment, the rice, rape, and annual yields were significantly increased by 6.19%, 7.67%, and 6.54%, respectively (P<0.05). In general, straw returning combined with chemical fertilizer was of great significance to improve the soil carbon pool, soil fertility, and crop yield in the Chaohu Lake area.

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