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不同深度秸秆还田对黄棕壤氮素和微生物生物量碳氮的影响
张奇1, 陈粲2, 陈效民1, 任晓明1, 张志龙1, 刘巍1
1.南京农业大学 资源与环境科学学院, 江苏 南京 210095;2.南京信息工程大学 应用气象学院, 江苏 南京 210044
摘要:
[目的]研究不同深度秸秆还田对土壤氮素和微生物生物量碳、氮含量变化的影响,为提高还田秸秆利用效率提供科学依据。[方法]采用田间小区试验的方法,共设5个不同处理:对照CK(不添加秸秆),T0(表面覆盖),T10(10 cm还田),T20(20 cm还田),T30(30 cm还田)处理。[结果]①与对照相比,秸秆还田处理中土壤有机质、全氮和硝态氮含量分别增加了3.98%~29.36%,2.72%~45.52%,10.48%~56.64%,铵态氮降低了7.75%~39.20%;②秸秆还田处理对土壤微生物生物量有显著影响,与对照相比,秸秆还田处理中土壤微生物生物量碳和氮分别增加了5.01%~35.78%和9.69%~52.56%;③运用主成分分析方法评估了秸秆还田各处理土壤质量状况,综合得分次序为:CK < T30 < T0 < T20 < T10,在10和20 cm深度秸秆还田对土壤氮素水平和微生物生物量碳和氮含量的提高具有较好的作用,且以10 cm秸秆还田处理效果最为明显。[结论]秸秆还田可以提高土壤氮素水平和微生物生物量碳和氮含量,改良土壤性状,在秸秆还田深度为10和20 cm效果较好,尤其10 cm秸秆还田对土壤中氮素和微生物生物量碳氮的影响最为显著。
关键词:  黄棕壤  秸秆还田  微生物量  土壤氮素
DOI:10.13961/j.cnki.stbctb.2019.02.009
分类号:S157.3
基金项目:江苏省自然科学基金项目“不同秸秆还田方式下旱地农田温室气体的长期模拟与预测”(BK20150909);中国科学院南京土壤所开放基金项目(Y20160038);博士后基金项目(2016M591884)
Effects of Straw Returning to Different Soil Depths on Soil Nitrogen and Microbial Biomass Carbon and Nitrogen in Yellow Brown Soil
Zhang Qi1, Chen Can2, Chen Xiaomin1, Ren Xiaoming1, Zhang Zhilong1, Liu Wei1
1.College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China;2.College of Applied Meteorology, Nanjing University of Information, Science and Technology, Nanjing, Jiangsu 210044, China
Abstract:
[Objective] This paper studied the effects of straw returning on soil nitrogen and microbial biomass carbon and nitrogen contents in different soil depths to provide scientific basis for improving the efficiency of returning straw.[Methods] Five different treatments were labeled as control CK(no straw), T0(surface coverage), T10(10 cm returning field), T20(20 cm returning field), T30(30 cm returning to the field).[Results] ① Compared with the control, the contents of soil organic matter, total nitrogen and nitrate nitrogen in straw returning treatments increased 3.98%~29.36%, 2.72%~45.52%, 10.48%~56.64%, respectively. The contents of ammonium nitrogen decreased about 7.75%~39.20%. ② The straw returning treatment had a significant effect on soil microbial biomass. Compared with the control, the soil microbial biomass carbon and nitrogen increased 5.01%~35.78%, 9.69%~52.56%, respectively. ③ Principal component analysis method was used to evaluate the soil quality with different straw returning treatments. The comprehensive score order was CK < T30 < T0 < T20 < T10. When the straw returned to the field at 10 cm and 20 cm depth, labeled T10 and T20 treatments, had more significant effects on soil nitrogen levels and microbial biomass carbon and nitrogen contents than other treatments had, and the treatment effect of 10 cm straw returning was most obvious.[Conclusion] Straw returning could increase soil nitrogen and microbial biomass carbon and nitrogen content, improve soil traits. Better effects for 10 cm and 20 cm depths of straw returning were found, especially for 10 cm depth straw returning, and its effect were the most significant in soil nitrogen and microbial biomass carbon and nitrogen.
Key words:  yellow brown soil  straw returning  microbial biomass  soil nitrogen