摘要
农田景观中非农生境对生物多样性保护、耕地多功能性和农业产量等具有重要影响.本文选择中国城市化过程中生物多样性保护与农业高产需求相互冲突的典型地区沈阳市沈北新区为研究区采用信息熵模型划分为城市近郊、城市边缘区和乡村区域采用手捡法和Baerrnann法调查,鉴定了节肢动物和土壤线虫,并通过线性回归分析确定了非农生境类型、结构及数量与土壤动物的协同关系.结果表明:沈北新区农田景观的非农生境斑块面积均小于1 hm^2.随着与城市中心距离的增加,非农生境类型和比例逐渐增加,面积比例呈倒"U"型变化,斑块数量比例从8.6%增加到27.8%;土壤动物个体数呈现"U"型变化物种量无明显变化规律.乡村和城市近郊的非农生境斑块数量比与土壤动物个体数呈正向协同关系,城市边缘区无明显规律;非农生境面积比与土壤动物个体数均呈反向协同关系;非农生境斑块数量比和面积比与土壤动物物种量均无明显协同关系.
Non-cropped habitat in farm landscape plays a significant role in biodiversity,the functions of arable land and crop yields.This study focused on Shenbei New District in Shenyang City of Liaoning Province in Northeast China,which was a typical area with contradiction between biodiversity conservation and the high demand of agricultural production in the process of urbanization.Information entropy model,hand-picking and Baermann method were used for survey and identification of arthropods and nematodes in soils in urban suburban（US）,urban fringe area（UFA） and rural area（RA）.The cooperative relations between the number of soil animals and types,structure as well as the total amount of non-cropped habitat were investigated in these three types of areas using linear regression.Our results showed that the area of single patch in non-cropped habitat was smaller than one hectare in Shenbei New District,and the types and the proportion of non-cropped habitat patches were increasing along with the increase of their distance to the urban center.But the proportion of non-cropped habitats areas appeared under an inverted U-type change.The proportion of non-cropped habitat patches was from 8.6%to 27.8%.The individual number of soil animals showed the U-type trend,while their species number changed irregularly.The individual number of soil animals increased with the increase of the proportion of non-cropped habitat patches in RA and US.There was no obvious correlation between the individual number of soil animal and the proportion of non-cropped habitat patches in UFA.The individual number of soil animals decreased with the increase of the proportion of non-cropped habitats areas.There was no cooperative relation in the proportion of non-cropped habitats and the number of soil animal species.
出处
《应用生态学报》
CAS
CSCD
北大核心
2015年第12期3843-3848,共6页
Chinese Journal of Applied Ecology
基金
沈阳农业大学土地与环境学院青年创新项目资助
关键词
城市化
农田景观
非农生境
土壤动物
协同变化
沈北新区
urbanization
farmland landscape
non-cropped habitats
soil animals
cooperative relation
Shenbei New District
