论述了兴凯湖自然保护区昆虫地理分布区及两个不同生态环境昆虫区系的特征。
This paper discusses insects geographical distribution and the characteristics of two different eco-environment insects fauna in Xingkai Lake nature reserve.
的起源、栽培历史和分布区的自然生态条件、生长特性、栽培模式与品质特点。
Origin, cultivation history, natural conditions of distribution areas, growth characteristics, cultivation mode and nut quality of Juglans sigillata were expatiated.
但紫色土分布区的水土流失问题较为严重，对长江上游生态环境建设和安全都有不利影响。本文论述了紫色土的侵蚀和泥沙形成流失的特点。
The problem of severe soil and water loss in the purple soil area is adverse to eco-environment construction and safety in upper reaches of the Yangtze River.
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