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niche similarity ratio
相关语句
  生态位相似性比例
     Based on the investigating spatial structure of roots of trees and wheat in interface and nearby soil between forest belt and crops in agroforestry systems on the Loess Plateau, the niche breadth, niche overlap indexes and niche similarity ratio were calculated according to structure of absorbing roots of trees and wheat. The feature of niche in water and nutrients of trees and wheat in agroforestry systems were analyzed.
     以黄土塬区农林复合系统为对象,通过调查研究林带(杨树为主)与农作物界面附近土壤中树木和小麦根系的空间分布,利用树木吸收根和小麦根系生物量计算生态位宽度、生态重叠指数和生态位相似性比例,并据此分析林木和农作物种群在水分和养分资源轴的生态位特征。
短句来源
  相似匹配句对
     Niche
     生态位
短句来源
     ON THE MEASURES OF NICHE OVERLAP AND SIMILARITY
     关于生态位重叠与相似的度量
短句来源
     On Similarity in Metaphor
     论隐喻的相似性基础
短句来源
     "Similarity" and "Dissimilarity"
     小议“似”与“不似”——兼谈中国画的造型特点
短句来源
     (4) niche;
     ( 4 )龛影 ;
短句来源
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Based on the investigating spatial structure of roots of trees and wheat in interface and nearby soil between forest belt and crops in agroforestry systems on the Loess Plateau, the niche breadth, niche overlap indexes and niche similarity ratio were calculated according to structure of absorbing roots of trees and wheat. The feature of niche in water and nutrients of trees and wheat in agroforestry systems were analyzed. There is niche breadth of wheat mostly in the soil between 0-40 cm. Alth6ugh...

Based on the investigating spatial structure of roots of trees and wheat in interface and nearby soil between forest belt and crops in agroforestry systems on the Loess Plateau, the niche breadth, niche overlap indexes and niche similarity ratio were calculated according to structure of absorbing roots of trees and wheat. The feature of niche in water and nutrients of trees and wheat in agroforestry systems were analyzed. There is niche breadth of wheat mostly in the soil between 0-40 cm. Alth6ugh there is niche breadth of trees in the soil where ranges from under trees to 1H and 0-100 cm, there is niche breadth of trees mostly in the soil where ranges from 0-100 cm under trees, 0-60 cm in 0.5H to 0-20 cm in 1H. The niche breadth of trees is bigger than that of wheat, so trees can use water and nutrient in deep-layer soil. It makes for alleviating competition for water and nutrient between trees and wheat. But trees are in dominant position for competition in agroforestry systems. There is niche overlap between trees and wheat within 1 H and mostly within 0.5 H. It becomes negative impacting crops that can be alleviated by saving irrigation and fertilization.

以黄土塬区农林复合系统为对象,通过调查研究林带(杨树为主)与农作物界面附近土壤中树木和小麦根系的空间分布,利用树木吸收根和小麦根系生物量计算生态位宽度、生态重叠指数和生态位相似性比例,并据此分析林木和农作物种群在水分和养分资源轴的生态位特征。小麦在40cm以上具有较大的生态位宽度,而林木在距林带1H处20cm以上土层到0.5H处60cm以上土层至林下100cm以上土层内具有较大的生态宽度,但林木在1H以内100cm土层其他空间土壤中也具有一定的生态位宽度。树木具有较大的生态位宽度,虽可利用深层土壤中的水分和养分资源,在一定程度上有助于缓解农林间作对水分和养分资源的利用性竞争,但树木居于竞争的优势者地位,形成对农作物的胁地负效应,距林带1H内林木对农作物生态位重叠,且在0.5H以内重叠较大,竞争剧烈,在此集流补水增肥有利于缓解林木胁地。

 
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