川西亚高山暗针叶林恢复初期土壤酶活性研究

研究以川西亚高山暗针叶林恢复过程中初级阶段的鲜类阔叶林（MBLF）、鲜类针阔混交林（MCBLF）和箭竹阔叶林（BBLF）土壤为研究对象,针对不同森林类型采用多点分层0-10 cm（A层）、10-20 cm（B层）、20-30 cm（C层）和30-40 cm（D层）]采样、测定混合样的方式,研究了不同森林类型不同土层土壤的pH值、有机碳、全氮、全磷含量及脲酶、酸性磷酸酶、淀粉酶、过氧化氢酶、蛋白酶和蔗糖酶活性。研究结果表明,MBLF、MCBLF、BBLF不同土层土壤pH值均低于5.0,有机碳、全氮、全磷含量呈下降趋势,且有机碳、全氮与A层土壤差异显著（P〈0.05）。MBLF和BBLF随土层深度的增加脲酶活性较A层呈显著下降趋势（P〈0.05）,而MCBLF土壤脲酶活性以B、C层活性最高,分别为A层的1.22和1.08倍。蔗糖酶和酸性磷酸酶活性呈现先升后降的趋势,均以MCBLF活性最高;在林型MCBLF和BBLF中,随着土层深度的增加,蛋白酶和淀粉酶活性较A层显著降低（P〈0.05）,而MBLF、MCBLF、BBLF过氧化氢酶活性则一直呈显著下降趋势（P〈0.05）,D层过氧化氢酶活性分别为A层的60.21%、73.37%和46.84%。

Changes of soil enzyme activities in the early period restoration of subalpine coniferous forests in western Sichuan, China

The study on soil pH, the content of organic carbon （TC）, total nitrogen （TN） and total phosphorus （TP）, as well as the enzyme activities including urease, acidic phosphatase, catalase, protease, amylase and sucrase were carried out in three different early period restoration forests （Moss-broad-leaved forests （MBLF）, Moss-conifer/broad-leaved mixed forests （MCBLF） and Bamboo-broad-leaved forests （BBLF）） of Sichuang, China. In each forest, the analyzed soils were sampled from different depths, 0-10 （A）, 10-20 （B）, 20-30 （C） and 30-40 （D） cm, in each forest. The results showed that all sampled soil pH values were less than 5.0. The content of TC, TN and TP were decreased with soil depth increasing, and there were significant difference （P〈0.05） between soil layer A and soil layer B, C and D. The activity of urease in soil layer A was significant higher than other soil layers in MBLF and BBLF, while the higher activity of urease happened in soil layer B and C in MCBLF, which were about 1.22- and 1.08 -fold compared to soil layer A. With the increase of soil depth, the activities of sucrase and acidic phosphatase were increased firstly, and then decreased in studied forests, and with the highest in MCBLF. The activity of protease was decreased with soil layer increased in all forests. The activity of amylase in MCBLF and BBLF was decreased accompanying with soil depth increased, the values in soil layer A were significant higher than in other soil layers; the same change trend were also found in the activity of catalase. Compared to layer A, the activity of catalase in MBLF, MCBLF, BBLF layer D were only 60.2%, 73.4% and 46.8%.