浙江省生态公益林土壤理化性质的初步研究

通过对222个固定样地土壤跟踪调查及对79个针阔混交林的典型样地资料分析表明,随着林分年龄的延长,土壤容重、毛管持水量等物理性质有不同程度的提高,但土壤营养成份则各因素表现各异,其中有机质含量随林龄的增长而提高;全氮、水解性氮在幼龄林阶段有所提高,中龄阶段则下降,成熟阶段又提高;全磷、速效磷、速效钾则在成过熟林时有下降的趋势。土壤有机质、全氮和水解性氮等主要土壤化学性能指标与针阔混交林中树种比例有密切关系,土壤有机质以针叶树占乔木总数的40%~60%时最高,平均林地土壤有机质达到36.691 7 g/kg,全氮、水解性氮、全磷和速效磷含量则以针叶树种占20%~40%时最高,分别为1.461 2 g/kg、158.992 6 mg/kg、0.363 4 g/kg、2.745 1 mg/kg。

Preliminary Studies on Soil Physic-chemical Properties of Ecological Forest in Zhejiang Province

222 permanent sample plots and 79 representative mixed acerose -coniferous forest sample plots were investigated and studied, the results showed that the soil bulk density, organic matter content, capillary water capacity and no -capillary water capacity were improved with the forest age increasing. The total N and Hydrolytic N increased during the young stand stage and decreased in immature timber and increased again during the mature forest stage; but total P, available P, and available K decreased in the mature forest. The main physic - chemical properties of soil such as organic matter content, total N and Hydrolytic N had close relations with the ration of conifers. The organic matter content reached the highest level, namely 36. 691 7g/kg when the ratio of conifers was 40% -60% , while the highest content of total N, Hydrolytic N, total P and available P were the highest when the ratio was 20% - 40% , namely 1. 461 2 g/kg, 158. 992 6 mg/kg,0. 363 4 g/kg,2. 745 1 mg/kg respectively.