安慧,王俊波,安钰.灌丛密度对毛乌素沙地南缘沙柳生长及土壤水分动态的影响[J].干旱地区农业研究,2012,30(1):197~203
灌丛密度对毛乌素沙地南缘沙柳生长及土壤水分动态的影响
Effects of shrub density on growth of artificial Salix psammophila and soil moisture dynamics in Mu Us sandy land
  
DOI：10.7606/j.issn.1000-7601.2012.01.34
中文关键词:  沙柳  栽植密度  土壤水分动态  生物量
英文关键词:Salix psammophila  planting density  soil moisture dynamics  biomass
基金项目:宁夏回族自治区自然科学基金(NZ0910)；国家重大基础研究前期研究专项 (2009CB426304)；国家自然科学青年基金项目(31000214)；教育部高等学校博士学科点新教师基金(20106401120001)
作者单位
安慧 宁夏大学西北退化生态系统恢复与重建教育部重点实验室, 西部生态与生物资源开发联合研究中心, 宁夏 银川 750021 
王俊波 宁夏大学西北退化生态系统恢复与重建教育部重点实验室, 西部生态与生物资源开发联合研究中心, 宁夏 银川 750021 
安钰 宁夏农林科学院荒漠化治理研究所, 宁夏 银川 750002 
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中文摘要:
      在毛乌素沙地南缘选择不同栽植密度（0.2、0.6 株/m2和0.8 株/m2）的沙柳人工灌丛，对沙柳生长特征及土壤水分进行研究。结果表明：不同栽植密度沙柳的生长特征存在显著差异，沙柳株高、平均冠幅直径、地上生物量、叶片生物量和茎生物量随着栽植密度的增加呈先增加后降低趋势。不同栽植密 度沙柳灌丛土壤水分动态存在明显差异，沙柳灌丛土壤含水量随着栽植密度增大呈先增加后降低趋势，在栽植密度0.6 株/m2（T2）达到最大值。在毛乌素沙地生境条件下，与水资源容量相适应的沙柳栽植密度约为0.6 株/m2，在该栽植密度下土壤水分含量基本上能满足沙柳的生理生态需水。
英文摘要:
      The patterns of the growth of artificial Salix psammophila shrubs and soil moisture in Mu Us sandy land was compared under different planting density during growing season. The experiment density included 0.2 plants/m2, 0.6 plants/m2 and 0.8 plants/m2. The results showed that plant ing density had significant effect on the patterns of the growth of artificial Salix psammophila shrubs. With the increasing of planting density, the plant height, average canopy, aboveground biomass, leaf biomass and stem biomass of Salix psammophila shrubs decreased after an initial increase. Planting density had significant effect on the soil moisture dynamic of artificial Salix psammophila shrubs. Soil moisture of Salix psammophila shrubs increased and then decreased with increasing of planting density, and the inflection point of the curve appeared in 0.6 plants/m2 density. The optimal density of artificial Salix psammophila shrubs was found to be approximately 0.6 plants/m2, because the best growth of Salix psammophila shrubs was in this density treatment.
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