Seasonal Use of Soil Water by Mature Velvet Mesquite
Seasonal Use of Soil Water by Mature Velvet Mesquite
复制标题
成熟天鹅绒豆科灌木对土壤水的季节性利用
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
D. Cable
中科院分区：
文献类型：
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作者：
D. Cable
亮点：Mesquites持续使用深度为3米的水，并向外超过树冠10米的水，但15米的水主要限于干旱时期，当靠近树木的水供应耗尽时。随着春季生长的开始，水从表层被提取得最快。随着季节的推进，供水区变得越来越厚。初春和初夏补给后的提取速率最高，晚秋最低。土壤中有效水分的差异占提取率差异的72%至88%。丝绒豆科植物对多年生禾草的竞争作用在豆科植物冠下及附近37.5 cm以上的土壤中最为明显，并随着距离的增加而逐渐减弱。在干旱年份，开口的竞争效应要比湿润年份严重得多。
Highlight: Mesquites used water consistently to a depth of 3 m and outward to 10 m beyond the crowns, but use at 15 m was limited mainly to drier periods when water supplies closer to the trees were depleted. With the start of spring growth, water was extracted most rapidly from the surface layers. As the season advanced, the watersupply zone became increasingly thicker. Rates of extraction were highest immediately after recharge in early spring and early summer, and lowest in late fall. Differences in available water in the soil accounted for 72 to 88% of the variation in rates of extraction. The competitive effect of velvet mesquite on perennial grasses is most severe in the upper 37.5 cm of soil under and near the mesquite crowns, and gradually decreases with distance into adjacent openings. The competitive effect in the openings is much more severe in dry years than in wet years.