Long-Term Effect of No-Tillage on Soil Organic Carbon Fractions in a Continuous Maize Cropping System of Northeast China
文献类型： 外文期刊
作者： Huang Shan;Sun Yan-Ni;Rui Wen-Yi;Zhang Wei-Jian;Liu Wu-Ren;Zhang Wei-Jian;Zhang Wei-Jian
作者机构：
关键词： particulate organic matter;soil aggregation;soil macroaggregate
期刊名称： PEDOSPHERE
ISSN：
年卷期：
页码：
收录情况： SCI
摘要： Increasing evidence has shown that conservation tillage is an effective agricultural practice to increase carbon (C) sequestration in soils. In order to understand the mechanisms underlying the responses of soil organic carbon (SOC) to tillage regimes, physical fractionation techniques were employed to evaluate the effect of long-term no-tillage (NT) on soil aggregation and SOC fractions. Results showed that NT increased the concentration of total SOC by 18.1% compared with conventional tillage (CT) under a long-term maize (Zea mays L.) cropping system in Northeast China. The proportion of soil large macroaggregates (> 2 000 mu m) was higher in NT than that in CT, while small macroaggregates (250-2 000 mu m) showed an opposite trend. Therefore, the total proportion of macroaggregates (> 2 000 and 250-2 000 mu m) was not affected by tillage management. However, C concentrations of macroaggregates on a whole soil basis were higher under NT relative to CT, indicating that both the amount of aggregation and aggregate turnover affected C stabilization. Carbon concentrations of intra-aggregate particulate organic matter associated with microaggregates (iPOM_m) and microaggregates occluded within macroaggregates (iPOM_mM) in NT were 1.6 and 1.8 times greater than those in CT, respectively. Carbon proportions of iPOM_m and iPOM_mM in the total SOC increased from 5.4% and 6.3% in CT to 7.2% and 9.7% in NT, respectively. Furthermore, the difference in the microaggregate protected C (i.e., iPOM_m and iPOM_mM) between NT and CT could explain 45.4% of the difference in the whole SOC. The above results indicate that NT stimulates C accumulation within microaggregates which then are further acted upon in the soil to form macroaggregates. The shift of SOC within microaggregates is beneficial for long-term C sequestration in soil. We also corroborate that the microaggregate protected C is useful as a pool for assessing the impact of tillage management on SOC storage.
分类号： S15
- 相关文献
作者其他论文 更多>>
-
A possible mechanism of mineral responses to elevated atmospheric CO2 in rice grains
作者：Guo Jia;Wang Xiao-wen;Guo Jia;Zhang Ming-qian;Zhang Wei-jian;Zhang Ming-qian;Wang Xiao-wen;Zhang Wei-jian
关键词：climate change;free-air CO2 enrichment (FACE);hidden hunger;nutritional quality;paddy field;rice
-
Impacts of Nighttime Warming on the Soil Nematode Community in a Winter Wheat Field of Yangtze Delta Plain, China
作者：Deng Ai-xing;Zheng Cheng-yan;Zhang Wei-jian;Bin, Zhang;Tian Yun-lu;Islam, Md Nurul;Mannat, Md Abdul
关键词：climate warming;FATI;soil nematodes;community structure;winter wheat