Ge Xiao-Gai, Xiao Wen-Fa, Zeng Li-Xiong, Huang Zhi-Lin, Huang Ling-Ling, Tan Ben-Wang
State Forestry Administration Key Laboratory of Forest Ecology and Environment, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China.
Ying Yong Sheng Tai Xue Bao. 2012 Feb;23(2):445-51.
Based on the measurements of soil nutrient contents and enzyme activities and the canonical correspondence analysis (CCA), this paper studied the relationships between soil nutrient contents and soil enzyme activities in different age Pinus massoniana stands in Three Gorges Reservoir Area. Among the test stands, mature stand had the highest contents of organic matter, total nitrogen, ammonium nitrogen, and available phosphorus in 0-20 cm soil layer, followed by middle-aged stand, and nearly-mature stand. With the increase of the stand age, soil invertase activity increased after an initial decrease, cellulase and polyphenoloxidase activities decreased gradually, while urease and peroxidase activities decreased after an initial increase. CCA analysis showed that the effects of the main soil parameters on the soil enzyme activities in the stands ranked in the sequence of total nitrogen > organic matter > pH > bulk density > ammonium nitrogen > available phosphorus. Soil invertase activity had significant positive correlations with soil organic matter, total nitrogen, and total phosphorus, while soil peroxidase activity significantly negatively correlated with soil organic matter, total nitrogen, total phosphorus, and bulk density. The soil was rich in main nutrients, invertase activity was relatively high, while peroxidase activity was relatively low. The activities of soil invertase, cellulase and peroxidase could be used as the good biological indicators in evaluating soil quality and fertility.
基于土壤养分含量和酶活性的测定以及典范对应分析（CCA），本文研究了三峡库区不同林龄马尾松林土壤养分含量与土壤酶活性之间的关系。在试验林分中，成熟林0-20 cm土层的有机质、全氮、铵态氮和有效磷含量最高，其次是中龄林，近熟林最低。随着林龄的增加，土壤蔗糖酶活性先降低后升高，纤维素酶和多酚氧化酶活性逐渐降低，脲酶和过氧化物酶活性先升高后降低。CCA分析表明，影响林分土壤酶活性的主要土壤参数排序为：全氮＞有机质＞pH＞容重＞铵态氮＞有效磷。土壤蔗糖酶活性与土壤有机质、全氮和全磷呈显著正相关，而土壤过氧化物酶活性与土壤有机质、全氮、全磷和容重呈显著负相关。土壤主要养分含量丰富，蔗糖酶活性相对较高，而过氧化物酶活性相对较低。土壤蔗糖酶、纤维素酶和过氧化物酶活性可作为评价土壤质量和肥力的良好生物学指标。
