半干旱草地长期封育进程中针茅植物根系格局变化特征

发布时间：2018-03-23 15:56

本文选题：封育　切入点：针茅　出处：《生态学报》2017年19期

【摘要】：以云雾山不同封育年限草地针茅植物根系和土壤为研究对象,对其根系特征、土壤特性及两者关系进行研究,以探讨分析封育对针茅根系格局的影响。结果表明:(1)针茅植物根系生物量、根长密度、根表面积和根体积在封育初期轻微下降,之后缓慢上升,并在封育30 a草地得到显著增加。(2)随封育年限增加,各根系指标在3种针茅物种间的组成格局具有类似变化规律,具体表现为:长芒草在放牧草地所占比例最高,之后逐渐降低,并在封育30 a草地消失;大针茅所占比例呈先升后降变化规律,并在封育22 a草地达到最大值;甘青针茅仅出现于封育30 a草地,且占据优势地位。(3)大针茅和甘青针茅0—0.6 mm径级根系比例高于大针茅,使其根系直径显著低于大针茅,比根长和比根面积显著高于大针茅;此外,长芒草根组织密度显著高于长芒草和甘青针茅。(4)长期封育在显著提高土壤水分、养分含量和土壤氮磷比的同时显著降低土壤碳氮比,但对微生物生物量碳、氮无明显影响。(5)针茅根系特征与土壤指标的关联性分析显示针茅根系受土壤氮资源的显著影响。
[Abstract]:The root system and soil of Stipa arundinacea with different fencing years in Yunwu Mountain were studied. The characteristics of root system, soil characteristics and their relationship were studied. The results showed that the root biomass, root length density, root surface area and root volume of Stipa chinensis decreased slightly at the initial stage of closure, and then increased slowly. After 30 years of fencing, there was a significant increase in grassland. 2) with the increase of the years of fencing, the composition pattern of root system indexes among the three species of Stipa arundinacea showed a similar change, which showed that the proportion of mango grass in grazing grassland was the highest. The proportion of Stipa grandis increased first and then decreased, and reached the maximum in 22 years of fencing, and only appeared in fenced grassland for 30 years. In addition, the root diameter of Stipa grandis was significantly lower than that of Stipa macrophylla, the specific root length and specific root area were significantly higher than that of Stipa grandis, and the ratio of diameter to diameter of root was higher than that of Stipa grandis, and the ratio of root diameter to root area was significantly higher than that of Stipa grandis. The tissue density of the root of Trifolium mongolicum was significantly higher than that of C. longifera and Stipa Glycyrrhiza.) Long-term closure significantly increased soil moisture, nutrient content and soil nitrogen / phosphorus ratio, but significantly decreased soil carbon to nitrogen ratio, but to microbial biomass carbon. The correlation analysis between the characteristics of Needwort root system and soil index showed that the root-line was significantly affected by soil nitrogen resources.
【作者单位】：西北农林科技大学动物科技学院;中国科学院水利部水土保持研究所;西北农林科技大学水土保持研究所;固原市园林管理所;
【基金】：国家“十三五”重点研发计划(2016YFC0500704) 中国科学院野外站联盟项目(KFJ-SW-YW028-07);中国科学院战略性先导科技专项(XDA05050202);中国科学院重点部署项目(KJZD-EW-TZ-G10) 国家自然科学基金重点项目(41230852) 农业部“现代农业产业技术体系建设专项资金资助”(CARS-35-40)
【分类号】：S812

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