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内蒙古武川县农田退耕还草对中小型土壤动物群落的影响

明凡渤1,门丽娜2,刘新民1**   

  1. (1内蒙古师范大学生命科学与技术学院, 呼和浩特 010022; 2东北林业大学林学院, 哈尔滨 150040)
  • 出版日期:2013-07-10 发布日期:2013-07-10

Effects of different management modes of grassland after returned from cropland on meso and microfaunal communities in Wuchuan County of Inner Mongolia, North China.

MING Fan-bo1, MEN Li-na2, LIU Xin-min1**   

  1. (1College of Life Science and Technology, Inner Mongolia Normal University, Huhhot 010022, China;2School of Forestry, Northeast Forestry University, Harbin 150040, China)
  • Online:2013-07-10 Published:2013-07-10

摘要:

2006年5—9月,以50 mL土壤环刀采集土样,以干、湿漏斗法分离湿生和干生中小型土壤动物,分析了内蒙古武川县农田退耕后不同还草管理措施对中小型土壤动物群落的影响,为退耕还草措施的评价提供依据。试验共捕获中小型土壤动物19845只,隶属于6门8纲8类。优势类群为线虫和线蚓,占总捕获量的比例分别为81.37%和15.68%。与农田比较,不同退耕还草管理方式均导致线虫个体数显著提高(P<0.05),并以退耕后种植菊芋+蒿属植物提高最为突出,线蚓、螨类和弹尾类个体数提高不显著;退耕后,中小型土壤动物群落垂直分布形式无显著变化,但种植紫花苜蓿导致螨类垂直分布的表聚性升高。结果表明:本研究地区所采取的几种农田退耕还草管理措施均对线虫数量的恢复有益;在退耕还草地的管理中,应该注意地表凋落物的保存和积累,以促进螨类和弹尾类数量的恢复。
 

关键词: 土壤养分, 植被类型, 回归模型, 克里金, 空间预测

Abstract: In May-September 2006, soil cores were sampled from the grasslands returned from cropland and under different management modes in Wuchuan County of Inner Mongolia by using soilcutting ring (50 mL), and the meso- and micro-fauna were isolated by dry- and wet funnel methods to study the effects of different management modes of grassland after returned from cropland on the meso- and micro-faunal communities, aimed to provide references for the evaluation of returning cropland to grassland. A total of 19845 meso and micro-fauna were collected, belonging to 6 phylum, 8 classes, and 8 groups. The dominant groups were Nematode and Enchytraeidae, accounting for 81.37% and 15.68% of the total individual numbers of the meso- and micro-fauna, respectively. As compared to that in cropland, the individual number of Nematode in the grasslands returned from cropland and under different management modes increased significantly (P<0.05), especially in the grassland planted with Helianthus tuberosu +Artemisia sp. However, the individual number of Enchytroidae, Acarina, and Collembola had less increase. After returning to grassland, no significant differences were observed in the vertical distribution of meso- and micro-faunal communities, but the Acarina in the grassland planted with Medicago sativa had an increase in surface gathering. Our results suggested that in the study area, all the management modes of grassland after returned from cropland were beneficial to the restoration of Nematode. In the management of the grasslands returned from cropland, more attentions should be paid to the reservation and accumulation of ground litters to promote the restoration of Acarina and Collembola.

Key words: soil nutrient, spatial prediction, Kriging, regression model., vegetation type