Xu Zhen-feng, Tang Zheng, Wan Chuan, Xiong Pei, Cao Gang, Liu Qing
Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
Ying Yong Sheng Tai Xue Bao. 2010 Nov;21(11):2727-33.
With open top chamber (OTC), this paper studied the effects of simulated warming on the activities of soil invertase, urease, catalase, polyphenol oxidase in two contrasting subalpine coniferous forests (a dragon spruce plantation and a natural conifer forest) in west Sichuan. The dynamic changes of soil temperature and soil moisture were monitored synchronously. In the whole growth season, simulated warming enhanced the daily mean temperature at soil depth 5 cm by 0.61 degrees C in the plantation, and by 0.55 degrees C in the natural forest. Conversely, the volumetric moisture at soil depth 10 cm was declined by 4.10% and 2.55%, respectively. Simulated warming also increased soil invertase, urease, catalase, and polyphenol oxidase activities. The interactive effect of warming and forest type was significant on soil urease and catalase, but not significant on soil invertase and polyphenol oxidase. The warming effect on soil catalase depended, to some extent, on season change. In all treatments, the soil enzyme activities in the natural forest were significantly higher than those in the plantation. The seasonal changes of test soil enzyme activities were highly correlated with soil temperature, but less correlated with soil moisture. This study indicated that warming could enhance soil enzyme activities, and the effect had definite correlations with forest type, enzyme category, and season change. The soil enzyme activities in the subalpine coniferous forests were mainly controlled by soil temperature rather than soil moisture.
本文通过开顶式生长室（OTC）研究了模拟增温对川西两种不同的亚高山针叶林（人工云杉林和天然针叶林）土壤蔗糖酶、脲酶、过氧化氢酶和多酚氧化酶活性的影响。同时监测了土壤温度和土壤湿度的动态变化。在整个生长季节，模拟增温使人工云杉林5厘米土壤深度处的日平均温度升高了0.61℃，天然针叶林升高了0.55℃。相反，10厘米土壤深度处的体积含水量分别下降了4.10%和2.55%。模拟增温还提高了土壤蔗糖酶、脲酶、过氧化氢酶和多酚氧化酶的活性。增温与森林类型的交互作用对土壤脲酶和过氧化氢酶有显著影响，但对土壤蔗糖酶和多酚氧化酶无显著影响。增温对土壤过氧化氢酶的影响在一定程度上取决于季节变化。在所有处理中，天然针叶林的土壤酶活性显著高于人工云杉林。供试土壤酶活性的季节变化与土壤温度高度相关，但与土壤湿度相关性较小。本研究表明，增温可提高土壤酶活性，且该效应与森林类型、酶种类和季节变化有一定相关性。亚高山针叶林土壤酶活性主要受土壤温度而非土壤湿度的控制。
