天然次生林分布范围缩小，人工林栽培面积增加；
The distribution area of natural secondary forests has reduced while that of man-made forests has increased.
药材900余种，是研究动、植物和天然次生林的科学基地。
More than 900 species of herbs, is to study animals, plants and natural forest science bases.
主要研究了辽宁东部山区天然次生林林冠截留降雨、林地土壤的渗透性能和贮水能力。
The canopy interception for rainfall, the infiltration and water-holding capacity of soil of main original secondary forest types in eastern mountain areas of Liaoning province were studied.
本研究为天然次生林采取合理的经营措施，指导各林分类型的经营实践活动提供理论依据。
In this study, it takes reasonable measures to operate the natural secondary forest guide the operation of the various forest types and provide a theoretical basis for practical activities.
在相同的立地条件下，天然次生林和混交林具有更好的维持地力作用和更高的水源涵养功能。
Under the similar site condition, the secondary forest and the mixed plantations had greater water conservation function and better maintenance of soil fertility than the pure stands did.
对近40年生以柞树为主的天然次生林采取不同抚育间伐措施后，定位研究林分凋落物的性质。
After different thinning measures were taken in the 40-year-old nature secondary forest mainly made of oaks, fixed samples were collected to study characteristics of litters.
根据小班资源的综合评价，并结合天然林保护的基本准则，将帽儿山天然次生林小班划分为4个保育等级。
Based on the synthetical assessing values and the conservation standards for natural forests, the sub compartments were divided into 4 conservation gradings.
灌木疏林林地群落兼有天然次生林的啮齿动物群落和农田啮齿动物群落的特性，优势种为达乌尔黄鼠和松鼠类。
The community in shrub forest owned both the characteristics of natural secondary forest and farmland, its dominant species were yellow mouse and squirrel too.
林下植被生物量随林龄增长而降低，所有年龄阶段红松人工林林下植被生物量都低于红松混交林和天然次生林。
The undergrowth vegetation biomass in Korean pine plantations declined over years and was less than that of the mixed forest of Korean pine and secondary natural forest at all age stages.
由此可见，太行山天然次生林在维持大气中O2和CO2平衡、调节气候、净化空气等方面起着相当重要的作用。
Thus, the natural secondary forest in Taihang Mountain plays a very import role in maintaining the equilibrium of CO2 and O2, regulating climate, cleaning air and so on.
涞源县植被属华北植物区系，现有植被大部分为灌草丛，其次是天然次生林和人工林，森林覆盖率为18.24%。
Vegetation is Laiyuan County of North China flora, the majority of existing vegetation for irrigation in the bushes, followed by natural secondary forest and plantation, forest coverage is 18.24%.
本文以内蒙古大青山区人工林和天然次生林为研究对象，以不同林型枯落物和土壤水源涵养为重点，对不同林地的土壤水分和枯落物特性进行了系统研究。
This paper make Daqing mountain plantation and natural forest as research object, focus on different forest types of litter and soil water conservation, and make a systematically studied to them.
次生林就是经过砍伐后又长起来的天然林。
A secondary forest is a natural forest formed after the original forest was felled.
次生林就是经过砍伐后又长起来的天然林。
A secondary forest is a natural forest formed after the original forest was felled.
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