JOURNAL OF NATURAL RESOURCES ›› 2014, Vol. 29 ›› Issue (5): 801-809.doi: 10.11849/zrzyxb.2014.05.007

• Resources Evaluation • Previous Articles     Next Articles

Competition for Soil Moisture between Different Vegetation Types in the Water and Wind Crisscross Region of the Loess Plateau

QIAO Yan-qin1, FAN Jun2, GAO Yu2,3, WANG Sheng2,3, YI Cai-qiong1   

  1. 1. College of Resources and Environment, Northwest A & F University, Yangling 712100, China;
    2. State Key Laboratory of Soil Erosion and Dry land Farming on Loess Plateau, Northwest A & F University, Yangling 712100, China;
    3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-01-14 Revised:2013-09-04 Online:2014-05-20 Published:2014-05-20
  • Contact: 樊军(1974-),男,副研究员,主要从事土壤物理方面研究。
  • About author:10.11849/zrzyxb.2014.05.007

Abstract: Below ground interactions for water among neighboring vegetation were studied in the water and wind erosion crisscross region of the Loess Plateau by field survey. The purpose of the study is to investigate water competition among vegetation types by contrast analysis of soil moisture and aboveground biological characteristics. The experiment included four land use types (abandoned land, caragana land, alfalfa land and farmland) and three replications. Soil samples were collected from 0 to 400 cm in summer, 2012. The aboveground biological characteristics (height, canopy diameter and biomass) were measured at the same time. The results showed that soil moisture content in the abandoned land and farmland decreased close to the caragana land and alfalfa land. The total soil water storage of the abandoned land decreased 75.3 mm from the first measured point (573.7 mm) to the fourth measured point (498.4 mm), and the total soil water storage of farmland decreased 71.6 mm from the second measured point (685.8 mm) to the first measured point (614.2 mm). Caragana affected soil moisture in adjacent abandoned land by at least 6 m in the horizontal direction. Soil water storage from the fourth measured point of caragana land to the fourth measured point of alfalfa land were all smaller than 400 mm, and soil water storage (360.3 mm) of the second measured point of alfalfa land affected by caragana and alfalfa was the lowest among all measured points. Moreover, caragana near abandoned land and alfalfa near farmland have a higher biological index than the other measured points. This means that these two deep root plants absorbed soil water from neighboring land. So, planting caragana and alfalfa together would lead to intensive competition for soil water. Plants with shallow roots and deep roots should be arranged together when vegetation restoration is conducted in arid or semi-arid regions in order to delay soil water depletion.

CLC Number: 

  • S152.7