不同人工林对土壤有机质的影响

Influences of Different Plantations on Soil Organic Matters

[目的]选出适合察右后旗土壤条件的人工林地树种,为当地的人工林地建设提供理论参考。[方法]对土牧尔台林场不同人工林地及无林地的土壤有机质进行调查采样、室内实验分析。[结果]在所有被选样地的各个土层中,大部分的有机质含量为6~20 g/kg。榆树人工林林缘、林内、林间及草地与杨树林带内和外缘的土壤有机质含量差异显著。整体来看,5个土层的土壤有机质含量差异极显著。各样地间表层土壤的有机质含量变化较大。杨树林带内表层土壤的有机质含量高于杨树林带外缘。榆树林地的土壤有机质含量与草地的土壤有机质含量无显著差异,但显著高于杨树林地。[结论]榆树和杨树对土壤的改良作用都不明显,但榆树优于杨树。

[Objective] The aim was to select out plantation trees suitable for the soil condition of Chayouhouqi banner and provide theoretical reference for the construction of local plantations.[Method] The soil organic matters of different plantations and nonstocked land of Tumuertai forest farm were investigated,sampled and analyzed in laboratory.[Result] In various soil layers of all the selected sample lands,the contents of organic matters in the most soil layers were between 6 and 20 g/kg.The contents of organi matters in soil had significant difference between grass land, the edge, inner and inter- space of elm plantations and the ＇band internal space and outer edge of poplar plantations. Totally, the contents of organic matters in soil of the 5 soil layers had extremely significant difference. The contents of organic matters in surface soil of all the sample lands changed greater. The content of organic trotters in sttrface soil in the ＂band internal space of poplar plantations was higher than that in their outer edge. The content of organic matters in soil of elm planta- tions had no significant difference from that of grass land, but it was significantly higher than that of poplar plantations. [ Conclusion] Both elm and poplar had no obvious improving effect on soil, but ehn was superior to poplar.