土壤水的动态和年轻的红茶树 (Aspalathus linearis) 植物的生物质生产
Roeline van Schalkwyk1, J Eduard Hoffman2, Ailsa G Hardie2
1Department of Soil Science, Stellenbosch University, Stellenbosch, South Africa. roelinevs@gmail.com.
Scientific reports
|September 13, 2023
概括
在降雨量较低的地区在深层土壤上种植的未受精的红茶树 (Aspalathus linearis) 产量更高. 这是由于适应的根系和独特的凝结-蒸发循环来收集水,比受精植物的表现更好.
科学领域:
- 农业科学 农业科学
- 土壤科学 土壤科学
- 植物学 植物学
背景情况:
- 红 (Aspalathus linearis) 是南非特有植物,在降雨量低的地区对商业栽培至关重要.
- 关于红豆的土壤水平衡的数据有限,这对于了解其在干旱环境中的种植至关重要.
- 了解土壤和水的动态对于西开普和北开普的可持续红豆种植至关重要.
研究的目的:
- 为了研究无机肥和土壤深度对年轻红豆种植地的土壤水动态的影响.
- 评估这些因素对红豆植物生长和干旱条件下的生存策略的影响.
- 确定最佳的种植实践,以最大限度地提高水资源稀缺地区的红豆生产.
主要方法:
- 在西开普州纳尔杜斯伯格的一个年轻的红豆种植园进行的现场研究,在2016/17赛季.
- 在浅层和深层土壤地点,在未受肥,受肥和裸露的土壤地块上监测土壤水含量.
- 在生长季节结束时测量了植物生长参数,包括树枝生物量和根特征.
主要成果:
- 种植和裸露地块的土壤含水量和蒸发转化率相似,表明休在沙土中收集水是无效的.
- 除了深层土壤中的特定根区深度外,水含量在夏季下降到永久枯点以下.
- 在深层土壤上的未受精的植物表现出最高的发芽生物质和最长的尾根,而受精的植物由于高度的度而增长减缓.
结论:
- 红茶植物通过适应的根系和独特的凝结蒸发循环在10-30厘米的土壤层中收集水,以抵御干旱.
- 建议在更深的土壤上种植未受精的红豆,以提高产量,特别是在干旱条件下.
- 来自施肥的高含量会对红豆树的生长和生物质积累产生负面影响.
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