狭叶锦鸡儿灌丛沙堆土壤水分和肥力的时空分布

发布时间：2018-01-05 19:07

本文关键词：狭叶锦鸡儿灌丛沙堆土壤水分和肥力的时空分布　出处：《干旱区研究》2016年02期 　论文类型：期刊论文

【摘要】：通过对内蒙古高原草原区、荒漠草原区和荒漠区狭叶锦鸡儿(Caragana stenophylla)不同发育阶段灌丛沙堆土壤有机质、全氮、全磷、速效磷和水分的空间分布研究。结果发现:3种生境中,灌丛土壤水肥含量表现为:草原区荒漠草原区荒漠区。在草原区和荒漠草原区,狭叶锦鸡儿灌丛沙堆土壤全氮和全磷随土层加深(0~10 cm、10~20 cm、20~40 cm)呈逐渐增加趋势,而速效磷和水分相反;草原区灌丛沙堆土壤有机质富集于0~10 cm土层,荒漠草原区富集于20~40 cm土层。在荒漠区,灌丛对水分和大部分养分(除速效磷)的层间分布影响不大,而20~40 cm土层的速效磷含量逐渐减少。3种生境中狭叶锦鸡儿灌丛内的养分含量均高于灌丛外相同土层,且随着灌丛增大,这种趋势越来越明显;在草原区,随着狭叶锦鸡儿冠幅增大,灌丛土壤水分含量呈显著下降趋势,在荒漠草原区和荒漠区,灌丛土壤水分含量随着灌幅增大而增加。这说明狭叶锦鸡儿灌丛改变了土壤水分和肥力的空间分布,这种效应是在灌丛沙堆的发育过程中逐渐形成,并体现出来的。
[Abstract]:The soil organic matter, total nitrogen and total phosphorus of scrub sandpile in different development stages were studied in the grassland, desert grassland and desert area of Inner Mongolia. The spatial distribution of available phosphorus and water was studied. The results showed that the content of water and fertilizer in scrub soil of three habitats were as follows: desert grassland desert region desert grassland and desert grassland. The total nitrogen and total phosphorus in the sandy pile of Caragana angustifolia increased gradually with the deepening of soil layer (10 ~ 10 cm ~ (-1) ~ 10 ~ (20) cm ~ (-1) ~ (20) cm ~ (20) ~ (40) cm), but the available phosphorus and water content were opposite. The soil organic matter of shrub sand pile in grassland area is concentrated in 0 ~ 10 cm soil layer, and desert grassland area is in 20 ~ 40 cm soil layer, and it is in desert area. The shrub had little effect on the interlayer distribution of water and most nutrients (except available phosphorus). However, the available phosphorus content in the soil layer of 20 ~ 40cm was decreased gradually. 3. The nutrient content of Caragana angustifolia shrub was higher than that of the same soil layer outside the shrub, and with the increase of the shrub, the trend was more and more obvious. In the steppe area, with the increase of the crown width of Caragana angustifolia, the soil moisture content of shrub showed a significant downward trend, in desert grassland and desert region. The soil moisture content increased with the increase of shrub amplitude, which indicated that the spatial distribution of soil moisture and fertility was changed by Caragana angustifolia shrub, and this effect was gradually formed during the development of shrub sand heap. And embody it.
【作者单位】：天津师范大学生命科学学院天津市动植物抗性重点实验室;
【基金】：国家自然科学基金项目(31570453,31170381)
【分类号】：S714
【正文快照】： 锦鸡儿属(Caragana)植物属于豆科(Legumino-sae),全世界有100余种,主要分布在亚洲和欧洲的干旱和半干旱地区〔1-3〕。狭叶锦鸡儿(Caraganastenophylla)是锦鸡儿属的重要物种,分布于我国内蒙古高原和新疆北部〔4〕。狭叶锦鸡儿能适应半湿润、半干旱和干旱环境,在内蒙古草原区、

【参考文献】