| Varying characteristics of organic carbon and humus carbon under or outside the branchy tamarisk canopy in sand land in Northwest Sichuan |
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| DOI：10.7606/j.issn.1000-7601.2017.04.03 |
| Key Words: Northwest Sichuan sand land branchy tamarisk canopy soil organic carbon humus carbon |
| Author Name | Affiliation | | LIU Xiao-jing | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | HU Yu-fu | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | SHU Xiang-yang | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | XU Hao-yang | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | HE Jian-feng | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | WANG Qian | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China |
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| Abstract: |
| In order to identify the effect of organic carbon and humus carbon under or outside the branchy tamarisk canopy in sand land in Northwest Sichuan province, the semi-restored sand with 24-year ecological restoration age was taken as sample. We studied the varying characteristics of soil organic carbon and humus carbon of shrub rhizosphere (SR), shrub middle (SM), shrub edge (SE) and shrub without (SO) at different sand land layers. Field investigation, sample collection and laboratory analysis were employed. The results are as follows. The content of soil organic carbon(SOC), humic acid carbon(HAC), fulvic acid carbon(FAC) and humin carbon(HMC) decreased with the increase of the horizontal distance from the shrub. The content of SOC in SR, SM, and SE in 0-20cm depth was respectively 1.86, 2.35 and 1.63 times of that in SO. HC in SR, SM, and SE in 0～20 cm depth was respectively 1.96, 0.68 and 1.22 times of that in SO. Under the same conditions of the horizontal distance from the shrub, soil organic carbon and humus carbon contents showed a trend of decrease with the increase of soil depth. In SR, SOC in 20～40 cm and 40～60 cm soil layer decreased by 32.31% and 38.38% respectively compared with 0～20 cm. HC in 20～40 cm and 40～60 cm soil decreased by 49.34% and 53.40% respectively in relation to the 0～20 cm soil. We found that spatial heterogeneity of SOC and HC was high. |
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