红壤坡地不同覆盖措施的水土保持效益分析

应用江西省水土保持生态科技园红壤坡地的观测资料,对不同水土保持措施的效益和柑橘生长情况进行了分析研究.结果表明:百喜草全园覆盖措施蓄水保土效果显著,而狗牙根带状覆盖措施柑橘产量最高.百喜草全园覆盖措施与狗牙根全园覆盖措施相比,其蓄水效益提高72.1%;百喜草全园覆盖措施与阔叶雀稗草全园覆盖措施相比,其保土效益提高98.9%;狗牙根带状覆盖措施与百喜草带状覆盖 黄豆或萝卜套种措施相比,其柑橘产量提高54.9%.虽然红壤坡地种植百喜草能显著控制坡面水土流失量,但由于百喜草是高耗水牧草植物,耗水耗肥多,在需水关键期与柑橘形成竞争关系,因而影响了柑橘产量.

Benefits of soil and water conservation in red-soil slope land by adoption of different coverage measures

An analysis was made on the benefits of different measures for soil and water conservation and their influences on the growth of oranges based on the observed data of red-soil slope land in Soil Conservation Ecological Science & Technology Demonstration Park in Jiangxi Province.The results showed that the effect of soil and water conservation in red-soil slope land was significant when it was fully covered with Paspalum notatum flgge,while the orange yield of red-soil slope land when it was zonally covered with Cynodon dactylon was the highest.The benefit of water conservation in test plots fully covered with Paspalum notatum flgge was improved by 72.1% as compared with that of the plots fully covered with Cynodon dactylon,the benefit of soil conservation in test plots fully covered with Paspalum notatum flgge was improved by 98.9% as compared with that of the plots fully covered with Paspalum wettstein hackel,and the orange yield of test plots zonally covered with Cynodon dactylon was improved by 54.9% as compared with that of the plots zonally covered with Paspalum notatum flgge and inter-planted with soybean or radish.Although Paspalum notatum flgge planted in red-soil slope land can effectively control water and soil erosion,it consumes much water and fertilizer,hence reduces the orange yield.