中文摘要：

为了解决南方石灰岩红壤地区油茶间种玉竹坡地水土流失问题,采用野外标准径流小区试验方法,分别采用了油茶间种玉竹林地挖截流沟（ID）、油茶地间种玉竹（BP）、油茶地清耕（CK）等3种不同的耕作方式,进行了为期2 a的保土改土效应试验研究。试验结果表明：与CK试验小区比较,ID试验小区的减流率（70.2%）、减沙率（80.5%）均大于BP试验小区的减流率（50.3%）、减沙率（55.1%）,且其减流减沙效应均随其产流产沙量的增加而提高;0~20 cm土层的土壤含水率,ID试验小区比CK试验小区提高4.3%~4.7%,且含水量的提高幅度随含水量的提高量而递减;试验前与挖截流沟2年后ID试验小区的土壤容重,10~20、5~10 cm土层的分别降低了0.19、0.21 g/cm3,其降低率分别为11.9%、13.4%,且ID比CK分别降低了1.9%、3.3%,分别多降低了10.0%、10.1%;土壤有机质、全量养分、速效养分含量,ID比CK分别提高了21.8%、8.6%、22.6%;油茶移栽整4年及2011年测定的油茶地径、冠幅、春梢数量,ID试验小区较CK小区分别增加了49.6%、201.7%、46.4%,且ID试验小区的玉竹产量比BP小区提高了421.5 kg/hm2,提高率为7.4%,处理间的差异达到了显著水平。文中研究得出,油茶间种玉竹林地等高挖截流沟是行之有效的保土改土措施,且其适用范围广,不仅南方适用,北方也适用,值得大力推广。

英文摘要：

In order to solve the problem of water loss and soil erosion in sloping fields of Camellia oleifera and Polygonatum odoratum at the southern limestone red soil regions of China, using the method of standard runoff plot test, a set of soil modification and conservation tests were put forward for two years, under three ways of interplanting P. odoratum and digging intercepting ditch（ID）, interplanting P. odoratum（BP） and clean tillage（CK） at C. oleifera forest lands. The results showed that the ratio of fl ow reduction（70.2%） and sediment reduction（80.5%） in the ID test plots were higher than those at the BP test plots（50.3%, 55.1%）, and the effects of fl ow and sediment reduction were increased with increasing of fl ow and sediment amount. Compared with CK, the moisture content in 0-20 cm soil layer of the ID test plot was increased by 4.3%-4.7%, and its increased amplitude was decreases with increasing of moisture content. Compared with before the test, the volume weights of 10-20 cm and 5-10 cm soil layers at the ID test plot were decreased by 0.19 and 0.21 g/cm3 after two years, which were a decreased rate of 11.9% and 13.4% respectively, its decrease rates were more 10% and 10.1% than CK（1.9% and 3.3%）. Organic matter, total nutrient and available nutrient in soil of the ID test plot were increased by 21.8%, 8.6% and 22.6% respectively compared with CK. On the 4th year of transplanting C. oleifera trees, ground diameter, crown width and spring shoot number were increased by 49.6%, 201.7% and 46.4% respectively compared with CK. The yield of P. odoratum at the ID test plot（421.5 kg/hm2） was increases by 7.4% than that at the BP test plot, and the difference was very significant. Therefore, digging intercepting ditch in interplanting fields of C. oleifera and P. odoratum was an effective measure for soil and soil modification, and it had a wide range of application and should be vigorously promoted.