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The key factor causingthe variation of soil bulk density was the uneven distribution of soil texture.

土壤质地不均匀分布是引起土壤容重变化的关键因素。

In each kind of different cloud, its cloud drop size distribution isvarious, creates the cloud drop size uneven reason is in thesurrounding air the water vapor shift as well as cloud dropevaporating.

在各种不同的云内，其云滴大小的分布是各不相同的，造成云滴大小不均的原因就是周围空气中水汽的转移以及云滴的蒸发。

Control method were applied to natural mixed uneven-aged stands at the first time in China, and its inventory method were improved.

本研究将检查法应用于我国天然针阔混交林经营，并对调查方法加以改进。

that: uneven-aged, double layer and mixed structure were the key elements of forest structure.

目前，北京山区天然林结构多为异龄、复层和混交，而人工林多数是同龄、单层和纯林。

The confirmation method of mature level in uneven-aged forest is an insoluble problem both in forestry theory and forestry production at present.

以林木经济成熟径级确定为例，通过径级价值量被其径级材积除的模式转换办法，解析异龄林林木成熟的确定方法，进而为改善林业生产中异龄林采伐的盲目性提供依据。

The research results showed: spruce-fir mixed uneven-aged ecosystem managed in intensive method, its productive power and dominance were developed, the economic needs were met, environment and social effect were assured, so sustainable management of stands-level forest ecosystem were realized.

结果表明，经过集约经营的云冷杉针阔混交林，其生态系统生产力和优势得以最充分的发挥，既满足经济产出的要求，又保证了生态环境和社会效益，从而实现了林分级别上森林生态系统的可持续经营。

Based on stands-level forest ecosystem, referring intensive management method of natural mixed uneven-aged stands—control method, the mixed stands of coniferous and broad-leaved trees, in which spruce and fir are dominant species, were studied in this thesis;and explored sustainable management model on forest ecosystem level about economy, ecological environment and society.

本文以林分级别森林生态系统为基础，借鉴了天然异龄林集约经营方法—检查法，对长白山过伐林区以云冷杉为主的针阔混交林的森林可持续经营进行了研究，并从经济、生态环境和社会3个方面探索了森林生态系统尺度上的可持续经营模式。

In mixed or uneven-aged stands, due to the lack of a height/age relationship, the site index is not a reasonably reliable site productivity measurement.

在混淆或异龄林之林分，由於其树高和年龄间之关系并非如单纯林那样明确，使得以树高-年龄为基础所导出的地位指数无法理想地适用於混淆人工林内。

Uneven-aged forest stand ; matrix model ; transition probability ; parameter estimation

提出直接用直径生长量来估计异龄林林分生长矩阵中的转移概率。

Matrix ; uneven-aged ; policy ; diameter limit ; cutting cycle.

矩阵模型；异龄林；采伐周期；最小采伐直径

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。