锯末和保水剂对坡面棕壤土含水量的影响研究

Research on Sawdust and Super Absorbent Polymers on the Water Content of Brunisolic Soil in the Slope

在苜蓿的生长过程中，通过测量A区（锯末）、B区（保水剂）和C区（对照）土壤含水量、草产量及土壤密度，研究锯末和保水剂在坡面治理中对棕壤土含水量的影响。结果表明，坡面表层土壤含水量和降雨量的变化趋势基本一致，在20～30 cm土层，A区始终保持最高土壤含水量，最高百分比达3．96％。从标准差和变异系数来看，研究均表明A区土壤含水量稳定性强，从而说明锯末释放出的水分多于B区同价格的保水剂释放的水分。最后指出，A区苜蓿平均株高和草产量均比B区和C区高，锯末区域20～30 cm土层土壤密度变化最小，适宜苜蓿生长的土壤密度为1．24～1．38 g/cm3。试验结果为在干旱半干旱地区坡面治理中可以用廉价的锯末来代替保水剂，增加效益。

During the process of the alfalfa growing ,Areas A （sawdust） ,B （SAP） and C （contrast） affect soil moisture ,grass pro-duction and the soil bulk density on sawdust and SAP moisture on brown soil in erosion control of slope surface .The results show that ,the change trend of rainfall and slope surface soil water content is almost the same .Area A＇s soil water containing is the highest all the time ,the highest percentage is 3 .96% .From the standard deviation and coefficient of variation ,studies show that the Area A＇s soil moisture is strong and stable ,so that sawdust release more water than SAP with the same price in Area B .Finally ,the aver-age plant height in Area A and yield are higher than Areas B and C ,the sawdust area 20～30 cm soil bulk density changes the smal-lest ,the soil bulk density of alfalfa growth well is 1 .24～1 .38 g/cm3 .The test result shows that in the slope control in arid and semi-arid areas ,cheap sawdust can be used instead of SAP ,it will increase benefit .