经营干扰对雷竹叶面积指数的影响

Decline in Bamboo Leaf Area Index as Affected by Management Disturbance

根据２０个雷竹标准地调查数据，推导了雷竹叶面积指数的数学模型，结果表明，覆盖保护地栽培使林地退化，林分生长势显著下降，叶面积指数较一般丰产竹林低１０％以上，严重衰退林分要低５０％左右。实施保护地栽培林分应加强营林措施，调整冠层结构，增大叶面积指数，确保竹林持续经营。

The mathematical model for bamboo leaf area index was derived from data collected in 20 sample plots of early spring shoot bamboo, Phyllostachys praecox. Analysis indicated that the rice husks and the like which are used to cover the bamboo grove in the wintertime so as to get more and earlier bamboo shoots are responsible for the degradation in soil fertility and growth potentiality of the bamboo. Generally, the leaf area index in such covered groves was 10-50 percent lower than ordinary productive bamboo groves. This suggests the necessity to raise the leaf area index by strengthened tending so that a sustainable production can be achieved.