《Table 8 Stepwise regression analysis of soil bulk density in each layer in Chengdu Plain》
本系列图表出处文件名:随高清版一同展现
《"Spatial variability of soil bulk density and its controlling factors in an agricultural intensive area of Chengdu Plain,Southwest China"》
1) SOM,soil organic matter.
Although analysis above has evaluated the relative contribution of structural or random factors on the spatial variability of soil bulk density,more efforts are needed to identify which one of the structural or random factors is the dominated factor in each soil layer.In our study,soil elevation,parent material and soil types including soil group,subgroup and soil genus were characterized as structural factors while soil organic matter and land use were classified as random factors.According to the stepwise regression analysis(Table 8),we found soil organic matter was determined as the controlling factor on the spatial variability of soil bulk density in each layer(Table 8).Numerous researches have shown soil organic matter was significantly negatively related with soil bulk density(Deng et al.2014;Wang et al.2014;Yang et al.2016).In agreement with the previous researches,our study also found soil bulk density in the study area played significantly negative relationship with soil organic matter in each soil layer(Table 4).Moreover,the correlation coefficient r decreased with increasing soil layer,indicating the effects of soil organic matter on bulk density became weaker as soil layer increasing.It is mainly because soil organic matter decreases with increasing soil layer due to the reduced exogenous input of organic material such as litter,roots and animal debris.
图表编号 | XD0047430800 严禁用于非法目的 |
---|---|
绘制时间 | 2019.02.20 |
作者 | LI Shan、LI Qi-quan、WANG Chang-quan、LI Bing、GAO Xue-song、LI Yi-ding、WU De-yong |
绘制单位 | College of Resources, Sichuan Agricultural University、College of Resources, Sichuan Agricultural University、College of Resources, Sichuan Agricultural University、College of Resources, Sichuan Agricultural University、College of Resources, Sichuan Agricultu |
更多格式 | 高清、无水印(增值服务) |
查看“Table 8 Stepwise regression analysis of soil bulk density in each layer in Chengdu Plain”的人还看了
- Table 3 Stepwise regression analysis among amount of green manure returned to field and tobacco quality and yield
- Table 4 Soil bulk density (BD, g cm–3) under different residue management and fertilizer treatments in 2015 and 20161)
- Table 3.Relative abundances of microbial phyla in rhizosphere and bulk soils at three growth stages.