1) precision screw
精密螺钉
2) fine adjustment screw
精调螺钉
3) density of Oncomelania hupensis
钉螺密度
1.
The result shows that the size of the stand crown cover performs negative correlation with the density of Oncomelania hupensis on the beach land.
林分郁闭度大小是改变林下生态环境的主导因素,通过对林下草本植物分布变化以及林下温度、湿度、光照及地下水位等因子的调查分析研究,结果表明:滩地林分郁闭度大小与钉螺密度呈负相关关系。
4) sealing screw
密封螺钉
6) snail distribution density
钉螺分布密度
1.
Based on oriental observing on the poplar plantation eco-system in Dongting Lake s beaches,the time-space changing regularity of dominant water factors and snail distribution density had been studied quantitatively in this paper.
对影响洞庭湖滩地杨树人工林生态系统钉螺分布密度的主导水分因子和钉螺分布密度的时空变化规律进行了定位观测研究。
补充资料：非密度制约因素(见密度制约因素)
非密度制约因素(见密度制约因素)
l焦非密度制约因素见生态因素、密度制约后
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条