查询词典 protective forest

Firstly, according to study dynamic changes of the elements structures in succession about natural and artificial forest, then summarized regular patterns;at the same time.based on the study of Coupling Relationship between structure and function of water conservation forest established the ideal structures from the stand level and the watershed level. The ideal structures from the stand level: uneven-aged, double layer and mixed structure, and trend to natural forest. The watershed level followed the same principle, that is double layer patches, uneven-aged forest well-distributed and to build up different forest patches in watershed.

首先，经过对北京山区水源林天然林和人工林结构要素的演替动态研究，提出其发展规律，同时依据水源林结构与功能耦合关系研究，从林分层次和流域层次上分别构建了水源林的理想结构，其中，林分层次上水源林的理想结构为：异龄、复层、混交的结构状态，林分结构趋于天然林结构的特征；在流域层次上水源林的理想结构为也应形成&复层&、&异龄&、&混交&的结构，即：在流域各水源林斑块间形成林冠层复层、斑块内部乔木、灌木、草本层的复层；不同水源林年龄面积上的均匀分布；形成不同水源林斑块间的镶嵌分布。

The system implemented forest fire model selection automatically and intelligently. BP artificial neural network model of forest fire model selection was build by treating forest fire environment data as inputting variable and treating appropriate forest fire model as outputting variable. At the same time, we studied the methods of acquiring and calculating data of inputting and outputting. The system implemented machine of model selection automatically based on dynamic data driven technology. We selected 72 items experimental data from historical forest fire records in Beijing to experiment and confirm the validity of model selection. It turned out that the reliability of model selection is more than 80 percent.

3基于BP人工神经网络方法设计了林火模型适宜性选择技术框架结构，通过神经网络形成林火模型选择知识，实现了林火模型的自动化和智能化选择；以火场环境因子为输入变量，以适宜火场环境模拟的林火蔓延模型作为输出变量，构建了林火模型选择神经网络模型；研究了输入、输出因子数据的获取与计算方式，实现了动态数据驱动的林火模型自动选择机制；以本京市为例，选择了有详细火场情况记录的72场林火作为实验样本，其中60条记录作为学习样本集，12条记录作为验证样本，对神经网络进行了学习和验证，实验结果表明，模型选择精度可达到80%以上。

The essay analyzes the present forest green GDP calculability system and finds that it has not formed the unified theory and method to the forest resources value calculability,the forest accounting is uncoordinated with the statistical calculability,and its calculability scope is inconsistent with the way,also has not the institution of the forest calculability system and so on.

通过对现行森林绿色GDP核算存在的森林资源价值核算没有形成统一的理论与方法、森林的会计核算与统计核算不协调、核算范围与途径不一致、没有相关的森林核算制度等问题进行分析后认为，必须尽快建立统一的森林绿色GDP 核算体系

In compliance with the objective route of historical development, and based on time and its contents, forest tourism culture in Zhejiang are divided into four periods: formation period, development period, prosperity period, and approaching modern times period; based on its representation of characteristics, it can be divided into origin and transition period, classifying and humanizing landscape and fusing forest period, enjoying and appreciating landscape and the climax of forest period, sight-seeing, exploring landscape and the science of forest period.

本论文应用历史研究的方法，从深入挖掘、系统整理史迹材料着眼，分析研究浙江森林旅游文化的渊源和流变，遵从历史发展的客观线索，按时间和内容将其分为形成期、发展期、繁荣期、走向近代的浙江森林旅游文化等四个时期；按其特征表现分为起源和过度期，归宿、"人化"山水和森林融合期，游览、欣赏山水和森林高潮期，观赏、探索山水和森林科学期等。

The study is carried out that the comparison of fine root production, decomposition and distribution along with Korean pine and broad-leaved climax forest succession; the fine root contribution to the belowground C and N storage along with Korean pine and broad-leaved climax forest succession; and the comparison of belowground C and N storage among the Korean pine and broad-leaved climax forest, three dark-conifer forests, a betula ermanii forest along altitude.

研究内容包括：原始阔叶红松林及其不同演替阶段的次生林中细根的生长和周转、分解与分布的特征，阐明在不同演替阶段细根的变化；原始阔叶红松林及其不同演替阶段的次生林中细根对根系、土壤和林地地下的碳、氮贮量的影响，分析在不同演替阶段细根周转对地下碳、氮贮量的贡献；以及对不同垂直海拔高度分布的不同类型的原始森林中细根和根系生物量的变化，及细根对根系、土壤和林地地下碳、氮贮量的贡献进行了研究。

7Gm〓 in the 20 yr forest, 1139. 8gm〓 in the 80 yr forest and 912. 4 gm〓 in the climax forest, respectively. However, along with forest succession, the dominant tree species fine root annual production increases, whereas other arboreal and grass fine root annual production decreases.

白桦山杨幼林、白桦山杨成熟林与原始阔叶红松林中，细根年生长量分别为712.7gm〓、1139.8gm〓和912.4gm〓；但是，随着演替的进行，林地主要树种细根的年生产量会逐渐增加，其它木本和草本细根的年生产量则逐渐降低。

In the 20 yr forest, 304. 6gm〓 C and 11. 6gm〓 N are inputted to the soil. In the 80 yr forest, 502. 3gm〓 C and 17. 2gm〓 N are inputted to the soil. In the climax forest, 430.3gm〓 C and 11. 9gm〓 N are inputted to the soil. Along with forest succession, the C inputted to the soil B layer by fine root increases because of the deepening of root depth distribution.

白桦山杨幼林、白桦山杨成熟林与原始阔叶红松林中，细根每年向林地周转的碳量分别为304.6gm〓、502.3gm〓、430.3gm〓，氮量分别为11.6gm〓、17.2gm〓、11.9gm〓；其中，随着演替的进行，由于根系分布的加深，细根每年向土壤B层周转的碳量会逐渐增加。

Along with the Korean pine and broad-leaved climax forest succession (a 20 yr Populus davidiana and Betula platyphylla secondary forest, an 80 yr Populus davidiana and Betula platyphylla secondary forest and the Korean pine and broad-leaved climax forest), the peak production of fine root is in early summer and autumn.

在原始阔叶红松林的演替过程中（白桦山杨幼林—白桦山杨成熟林—阔叶红松林），细根生长的季节变化特征是生长顶峰出现在初夏和秋季。

Shanlinsi Forest Recreational Park is located more than 2000 meters above sea level. Looking over the forest, it is full of towering cedars and cypresses with a natural and primitive breath of air. In this vast forest area, there is a well-known pristine eco-forest and dead cryptomeria trees standing tall in the swamp. Such desolate beauty makes people feel really lonely.

海拔超过二千公尺的杉林溪，放眼过去尽是高耸的杉树、桧木林，有著自然而原始的气息，而在这片面积广大的森林中，有一片鲜为人知的原始生态林、一片因为九二一阻塞河道形成的沼泽地，一棵棵死亡的柳杉笔直的朝向蓝天，有种孤寂、苍凉的美感。

In the same depth, the content of total nitrogen of broad-leaved deciduous forest in 0~10 cm depth is maximum ,and the average total nitrogen of the bamboo forest is maximum in 10~20 cm and 20~30 cm. The available phosphorus content of broad-leaved deciduous forest is minimum, and the available phosphorus content of coniferous forest is minimum, the deviancy is very big, which is mainly related to the human being's activities and the way of soil usage.

同一土层深度，落叶阔叶林在0~10cm土层全氮含量最高，而毛竹林在10~20cm和20~30cm土层全氮含量都超过落叶阔叶林，使得毛竹林在土壤平均全氮含量为最高；各种森林类型中以阔叶林尤其是落叶阔叶林的速效磷含量最高，而针叶林的速效磷含量最低，空间变动性很大，这主要和人类活动及土壤的利用方式有关。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48