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为了探究荒漠土壤活性有机碳组分对禁牧年限的响应,以伊犁绢蒿(Seriphidium transiliense)荒漠草地为研究对象,对不同禁牧年限(禁牧时间为0 a,1 a,4 a,11 a)荒漠草地0~50 cm的土壤有机碳(SOC)、易氧化碳(ROC)、易氧化碳分配比例(PROC)、轻组组分比例(LFR)、轻组有机碳(LFOC)、颗粒组分比例(PFR)、颗粒有机碳(POC)进行对比分析。结果表明:随着禁牧年限增加,0~10 cm土层SOC含量基本呈先降后升趋势,0~50 cm土层ROC、PROC总体呈增加趋势;与对照相比,禁牧区5~10 cm土层LFR、LFOC显著增加(P<0.05),0~50 cm土层PFR显著降低,POC变化不明显。总之,禁牧对SOC、POC影响较小,对ROC、PROC、PFR、5~10 cm土层LFR和LFOC影响较大,可作为伊犁绢蒿荒漠土壤对禁牧响应的敏感指标。
In order to explore the response of soil active organic carbon (CAC) in desert soil to grazing prohibition, taking Seriphidium transiliense desert grassland as research object, the effects of different grazing prohibition times (no-grazing time 0 a, 1 a, 4 a, 11 a) Soil organic carbon (SOC), carbon monoxide (ROC), PROC, LFR, LFOC, Component ratio (PFR), particulate organic carbon (POC) were compared. The results showed that with the increase of the grazing prohibition period, the SOC content in 0 ~ 10 cm soil layer basically decreased first and then increased, while the ROC and PROC in 0 ~ 50 cm soil layer showed an overall increasing trend. Compared with the control, The soil LFR and LFOC increased significantly (P <0.05), while the soil PFR decreased significantly at 0 ~ 50 cm soil layer, while POC did not change obviously. In conclusion, the grazing ban has little effect on the SOC and POC, but has a significant effect on the LFR and LFOC of the ROC, PROC and PFR in the 5 ~ 10 cm soil layer, which can be used as sensitive index for the response of banded grazing to the Sericulture of the Ili.