论文部分内容阅读
对甘肃省定西市黄土丘陵区不同植被恢复方式下的土壤水分、pH、有机碳(SOC)、全氮(TN)、碱解氮(AN)、全磷(TP)、速效磷(AP)、速效钾(AK)及微生物生物量、呼吸速率、呼吸熵(qCO2)以及微生物熵(qMB)进行了测定与分析。结果表明:不同植被恢复方式下,土壤pH值变化差异不显著(p>0.05);0~20cm土壤的SOC、TN、AN、TP、AP、微生物量碳(SMBC)、微生物量氮(SMBN)含量及微生物呼吸速率(MR)均为天然植被(CL)下最高,AK为自然恢复(Q)方式下最高,qCO2与qMB在人工重建+自然恢复(RZ)方式下最高;20~40cm土壤的SOC、TN、AN、TP、AP含量变化同0~20cm,AK、SMBC、SMBN、qMB及MR在RZ方式下最高;40~60cm土壤的SOC、TN、AN、AP及TP含量在CL方式下最高,SMBC、SMBN、qMB及MR在RZ方式下最高,AK、qCO2在Q方式下最高。相同植被恢复方式下,随土层深度增加,SOC、TN、AN、TP、AP、AK、SMBC、SMBN含量及qMB、MR均逐渐降低,但qCO2逐渐升高(除RZ方式)。不同植被恢复方式,SOC、TN、AN、SMBC、SMBN、qMB、MR及qCO2之间存在不同程度的相关性。
Soil moisture, pH, organic carbon (SOC), total nitrogen (TN), total nitrogen (AN), total phosphorus (TP), available phosphorus AK, microbial biomass, respiration rate, respiration entropy (qCO2) and microbial biomass entropy (qMB) were measured and analyzed. The results showed that there was no significant difference in soil pH value under different vegetation restoration methods (p> 0.05). SOC, TN, AN, TP, AP, SMBC, SMBN, Content and microbial respiration rate (MR) were the highest in natural vegetation (CL), AK was highest in natural recovery (Q), and qCO2 and qMB were highest in artificial restoration and natural recovery (RZ) The contents of SOC, TN, AN, TP and AP were the same in 0 ~ 20cm, AK, SMBC, SMBN, qMB and MR were the highest in RZ mode; SOC, TN, AN, AP and TP in 40 ~ Highest, SMBC, SMBN, qMB and MR are highest in RZ mode, AK, qCO2 is the highest in Q mode. Under the same vegetation restoration, SOC, TN, AN, TP, AP, AK, SMBC, SMBN, qMB and MR decreased with the increase of soil depth, but qCO2 increased gradually except RZ. There are different degrees of correlation between different ways of vegetation restoration, SOC, TN, AN, SMBC, SMBN, qMB, MR and qCO2.