essential species是什么意思

网络释义

用法例句

By using the data of area and main tree species of Guizhou province from 2000 to 2007,and eight different scenarios have been schemed for the annual area of GGP-forests during 2008~2010 and harvest options.

再依据贵州省森林资源清查中不同树种的的历史数据和生长参数建立生长方程,并结合生物量扩展系数、木材密度和碳含量等参数,预测出贵州省未来50年不同情景下的退耕还林主要树种树生物质碳储量及变化。

Study on interspecific association of main populations in arborous layer of nature forest in Wuyishan Scenery District;

武夷山风景名胜区天然林乔木层主要种群的种间联结性研究

Variance analysis, X~2 test, Ochiai index, Dice index and Jaccard index, which are based on 2×2 contingency table, were used to study the inter-specific association of 19 main populations of Alsophila spinulosa community in Mopan Gully, Fuling, Chongqing.

根据2×2联列表,应用方差分析、Χ2-检验、Ochiai指数、Dice指数和Jaccard指数,研究了重庆市涪陵磨盘沟桫椤(Alsophilaspinulosa)群落中19个主要种群间的联结性。

Population spatial distribution pattern of 15 main populations of stand layer and undergrowth in Cycas fairylakea community was investigated,in order to discuss the structure and succession direction and provide scientific foundation for the protection of C.

通过测定仙湖苏铁群落立木层及林下层各15个主要种群的空间分布格局,探讨仙湖苏铁群落的组成结构及演替趋势,为仙湖苏铁野生种群的保护提供科学依据。

The frequency distribution models,Taylor exponential equation,and Iwao s x *- method are used for analyzing the spatial patterns of four main trees in South-subtropical secondary broad-leaf forest.

本文应用频次比较、Ｔａｙｌｏｒ指数和Ｉｗａｏ方法全面分析了南亚热带次生阔叶林４个主要树种的空间分布格局，揭示了组成天然次生林群落的各优势种群的空间分布格局的成因及种群密度变化对分布的影

Analysis of spatial patterns of main species in the Korean-pine broadleaved forest;

云冷杉阔叶红松林主要树种种群空间格局分析

Interspecific Associations of Main Tree Species in the Communities with Magnolia odoratissima

馨香玉兰所在群落主要树种的种间联结性

The number of ingrowth was very small in all stands, the ingrowth mainly occurred for shade-tolerant tree species such as Spruce, Fir, Korean Pine and broad-leaved tree species.

林分进界株数严重不足，进界的主要树种是云冷杉、阔叶树和红松，以耐荫树种为主。

Tree seedlings of major species for afforestatio

GB6000-1985主要造林树种苗木

Synthetic Cure and Management of Lsa Sordida Nits of Main Virescence Wood Species in Harbin;

哈尔滨市主要绿化树种杨树烂皮病的综合治理

Study and Application on PGPR of Main Mangrove Afforestation Species in China

我国红树林主要造林树种PGPR研究及应用

Study on the Stem Density Variation of Main Plantation Tree Species in the Muddy Sea-coast in Jiangsu

江苏泥质海岸主要造林树种树干密度变异规律

Optimal height-diameter models for dominant coniferous species in Changbai Mountain,northeastern China

长白山主要针叶树种最优树高曲线研究

Code name of the main commercial timber

GB/T17663-1999主要商品木材树种代号

Tree seedling quality grading of major species for afforestation

主要造林树种苗木质量分级

Ripping logs--Species--Main application

GB/T143.1-1995锯切用原木树种、主要用途

cynipid gall wasps, chiefly affecting oaks.

瘿蜂，主要是侵袭各种橡树。

Tea is raised chiefly in China,Japan and India.

茶树主要种植在中国、日本和印度。

Study on Water Thresholds of the Main Afforestation Species on the Loess Plateau;

黄土高原主要造林树种水分阈值研究

Study on Mycorrhizalization of Major Tree Species for Afforestation in the Loess Plateau of West Henan Province;

豫西黄土高原主要造林树种菌根研究

Research on the Nutrient Use Efficiency of Main Planting Species in South China;

南方主要造林树种养分利用效率研究

A Comparative Study on the Culture Effects of Main Varieties of Mulberry in Panxi Area;

攀西地区主要桑树品种饲育效率比较

The Study on Major Character Variation of Torreya Grandis in Natural Population

榧树天然种群主要性状变异规律研究