间伐对尾叶桉人工林土壤理化性质、土壤微生物和土壤酶活性的影响

发布时间：2018-09-14 08:42

【摘要】：【目的】本研究探讨了抚育间伐对人工林土壤因子的重要影响。【方法】以东莞大岭山林场4种种间伐强度(CK:0%,M1:30%,M2:70%,M3:100%)的12年生尾叶桉人工林为研究对象,探讨了间伐7年后林分土壤的理化性质、微生物和酶活性在冬季和夏季的变化。【结果】(1)间伐对土壤理化性质的季节变化存在不同程度影响。冬季,间伐提高了土壤电导率、铵态氮、速效K、交换性Mg和交换性Na含量,M1显著减低土壤硝态氮,M1和M3林分显著减低土壤交换性Ca;夏季,间伐提高土壤全N、铵态氮、硝态氮和全P,降低土壤交换性Ca。(2)间伐对土壤微生物的影响存在着显著的季节差异性,间伐后夏季的土壤微生物碳和微生物氮显著高于冬季;随着间伐强度增大,土壤微生物碳和微生物氮在冬季和夏季均呈先上升后下降趋势。(3)间伐对土壤过氧化氢酶活性变化不显著,但能促进土壤磷酸酶和脲酶活性增大;磷酸酶活性表现为夏季较高,冬季较低;脲酶活性则相反。(4)PCA表明,不同季节间伐林分与未间伐林分在冬季和夏季对土壤因子响应显著不同,冬季间伐林分样地分布较散,夏季M2和M3林分能较好聚为一类,与土壤pH、铵态氮、硝态氮和过氧化氢酶因子相关。【结论】尾叶桉人工林间伐后林地的土壤理化性质向好的方向发展,对维持土壤生态系统的平衡和可持续发展具有重要的意义。
[Abstract]:[objective] to study the important effect of tending and thinning on soil factors of artificial forest. [methods] the 12-year-old Eucalyptus urophylla plantation with four kinds of thinning intensity (CK:0%,M1:30%,M2:70%,M3:100%) in Daling Mountain Forest Farm in Dongguan was used as the research object. The changes of soil physicochemical properties, microbial and enzyme activities in winter and summer after 7 years of thinning were studied. [results] (1) the seasonal changes of soil physical and chemical properties were influenced by thinning in different degrees. In winter, thinning increased soil electrical conductivity, ammonium nitrogen, available K, exchangeable Mg and exchangeable Na contents: M 1 significantly decreased soil nitrate N 1 and M 3 stands significantly decreased soil exchangeable Ca; in summer, and thinning increased soil total N and ammonium nitrogen. There were significant seasonal differences in the effects of nitrate nitrogen and total P on soil microorganism in reducing soil exchangeable Ca. (2) thinning. The soil microbial carbon and microbial nitrogen in summer after thinning were significantly higher than those in winter, and with the increase of thinning intensity, the soil microbial carbon and microbial nitrogen in summer were significantly higher than those in winter. Soil microbial carbon and microbial nitrogen increased first and then decreased in winter and summer. (3) thinning had no significant change in soil catalase activity, but could promote the increase of soil phosphatase and urease activity, and the activity of phosphatase was higher in summer. (4) PCA showed that the responses of thinned stand and unthinned stand to soil factors were significantly different in winter and summer, and the distribution of sample plots was scattered in winter, and the M 2 and M 3 stands in summer were better clustered into one group. (4) the activity of urease was lower in winter. (4) PCA showed that the response of thinned stand to soil factor was significantly different from that of non-thinned stand in winter and summer. It is related to soil pH, ammonium nitrogen, nitrate nitrogen and catalase factor. [conclusion] the soil physical and chemical properties of Eucalyptus urophylla plantation after thinning are developing well. It is of great significance to maintain the balance and sustainable development of soil ecosystem.
【作者单位】：东莞市林业科学研究所;
【基金】：东莞市国际科技合作(含港澳台)项目(2013508101020)
【分类号】：S714

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