翻耕补播措施对宁夏荒漠草原土壤碳氮储量的影响

以3种翻耕补播方式(深翻耕补播、浅翻耕补播和免耕补播,播量30kg/hm2)及深翻补播不同播量(7.5kg/hm2、15kg/hm2和22.5kg/hm2)为研究对象,以封育未补播为对照,研究了不同翻耕补播措施对宁夏荒漠草原土壤碳氮储量的影响.结果 表明:封育未补播处理可提高0～10cm土层土壤有机碳和全氮含量;深翻耕...

Effects of Tillage on Soil Carbon and Nitrogen Reserves in Desert Steppe of Ningxia

The effects of artificial plowing and reseeding(deep tillage,shallow tillage,no-tillage,with supplemeat of 30 kg/hm²),and deep tillage with supplementing(7.5 kg/hm²,15.0 kg/hm² and 22.5 kg/hm²)on soil carbon and nitrogen reserves were explored in desert steppe of Ningxia.The results showed that the contents of soil organic carbon and total nitrogen were increased in 0~10 cm soil layer in the control group(enclosure without artificial supplementing).In 10~20 cm and 20~40 cm soil layers,the soil organic carbon content was increased in deep tillage treatment,and the total nitrogen content was increased in deep tillage and deep tillage with artificial supplementing(15.0kg/hm²)treatments.The ratio of C to N in 0~10 cm soil layer was increased in deep tillage,deep tillage with artificial supplementing(7.5 kg/hm² and 15.0 kg/hm²),and control groups.The ratio of C to N in 10~20 cm soil layer was increased in shallow tillage and deep tillage with artificial supplementing(15.0 kg/hm²)treatments.The deep tillage with artificial supplementing(30.0kg/hm²)was more conductive to soil organic carbon and nitrogen reserves than other treatments.However,from the prospective of operability and cost,the enclosure without artificial supplementing was also conductive to soil organic carbon and total nitrogen reserves in the short term.Therefore,to balance local grassland ecological construction and sustainable development,long-term monitoring should be strengthened with combination of appropriate degraded grassland restoration methods.