光皮桦生长与环境因子的关系研究

以雅长林场九龙分场13 a光皮桦纯林作为研究对象，探索土壤酶活性、土壤化学元素以及林分温度对光皮桦生长的影响，采用相关性分析探究影响光皮桦生长的主要环境因子。结果表明，土壤酶活性与光皮桦树高、胸径、冠幅呈正相关，且相关性均较高，光皮桦生长受土壤酶活性的影响作用较大；除速效磷外，土壤中其他化学元素含量与光皮桦生长量相关性较高，其中总氮含量相关性最高，对光皮桦的生长起主导作用；光皮桦林分内地表温度、空气温度与其生长量的相关系数均较低，其与光皮桦的生长没有直接影响；土壤中的蔗糖酶活性、酸性磷酸酶活性、土壤总氮与光皮桦的相关性相对较高，因此，土壤蔗糖酶活性、酸性磷酸酶活性、总氮含量可能是影响光皮桦生长的主导环境因子。

Relationship between Growth of Betula luminifera and Environmental Factors

Taking the 13-year-old pure Betula luminifera forest in Jiulong branch of Yachang Forest Farm as the research object, this paper explored the effects of soil enzyme activity, soil chemical elements and forest temperature on the growth of Betula luminifera, and used correlation analysis to explore the main environmental factors affecting the growth of Betula luminifera. The main research results showed that soil enzyme activity was positively correlated with tree height,DBH and crown diameter of Betula luminifera, and the correlation was high, so the growth of Betula luminifera was greatly affected by soil enzyme activity; in addition to the relatively weak effect of available phosphorus, the content of other chemical elements in the soil were highly correlated with Betula luminifera, among which the total nitrogen content had the highest correlation and played a leading role in the growth of Betula luminifera; the correlation coefficients between the surface temperature, air temperature and the growth of Betula luminifera stand were very low, the stand surface temperature and air temperature had no direct influence on the growth of Betula luminifera; the invertase activity, acid phosphatase activity, soil total nitrogen and Betula luminifera had relatively large correlations in the soil. Therefore, soil invertase activity, acid phosphatase activity and total nitrogen content may be the dominant environmental factors affecting the growth of Betula luminifera.