核桃树体较大，定植密度较低，如紫花苜蓿、黑麦草、矮秆农作物等，以草养地，以肥促产。
Walnut tree is bigger, the planting density is low, such as alfalfa, ryegrass, dwarf crops, grass to care, to promote the production of fertilizer.
利用线性回归方程来确定植被郁闭度和鸟类数量和鸟类密度的关系。
The asymptotic regression function formulae were adopted to identify the relationships between the vegetation coverage and the Numbers of bird species and individuals.
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