宁南沙棘、柠条蒸腾和土壤水分动态研究

Study on the Transpiration of Common Seabackthorn and Caragana Microphy-lia and on the Dynamic State of Soil Water in Southem Ningxia

有效地利用土壤水分,维持水分平衡,是水土保持科研中的重要课题。通过对沙棘、柠条等树种的蒸腾和林地土壤水分动态的试验观测,本文得出如下结论:生产1克沙棘地上干物质总耗水为800克,其中蒸腾耗水483克,水分生产率为1.16g/ (mm·m^2);生产1克柠条地上干物质总耗水2264克,其中蒸腾耗水682克,水分生产率为0.44g/(mm·m^2)。因此沙棘、柠条水分利用率较高,可在半干旱地区大力发展。

Through experimental observation on the transpiration of Common Seabuckthorn and Caragana Microphylia and on the dynamic state of soil water in forest land ,the result is given out as follows: for a production of one gram of Common Seabuck thorn,the dry matter above ground would exhaust 800 gram of water, in which the water exhausted by transpiration is 483 gram and the water productivity is 1.16 g/mm.m2; while for a production of one gram of Caragana Microphylia, the dry matter above ground would exhaust 2264 gram of water, in which the water exhausted ,by transpiration is 682 gram and the water productivity is 0.44 g/mm.m2. The utilization rate of Common Se-abuckthron and Caragana Microphylia is relatively high artd they should be extensively planted in semiarid area.