毛乌素沙地臭柏、油蒿细根分解过程中养分与能量的变化

应用埋袋法对毛乌素沙地天然分布的优势种臭柏、油蒿细根分解进行研究。对两年的实验数据进行分析,结果显示,臭柏、油蒿细根分解过程中C、P、K、Mg均表现为释放,释放率油蒿＞臭柏,元素重量损失率K＞P＞C＞Mg;N在臭柏分解中表现为积累,在油蒿分解中表现为释放;Ca在臭柏、油蒿细根分解中都表现为积累的趋势,积累率为油蒿＞臭柏;能量在臭柏、油蒿细根分解过程中表现为释放。该研究为沙区土壤库中的能量转化和流动过程提供了理论依据。

Change of Nutrient and Energy in Process of Fine Roots Decomposition of Sabina vulgaris and Artemisia ordosica in Mu Us Sandland

The study on the fine roots decomposition of Sabina vulgaris and Artemisia ordosica in MU US Sandland was made by the means of a buried bag experiment. The experiment data of two-year showed that during the process of fine roots decomposition of Sabina vulgaris and Artemisia ordosica, C, P, K and Mg were released, and the release rate of S. vulgaris was bigger than A. ordosica; The loss rate of element weight showed a sequence of K＞P＞C＞Mg; There was an accumulation of N during the process of fine roots decomposition of S. vulgaris and a release for A. ordosica; There was an accumulation of Ca during the process of fine roots decomposition of S. vulgaris and A. ordosica, and the accumulation rate of A. ordosica was bigger than S. vulgaris; The energy was released in the process of fine roots decomposition of S. vulgaris and A. ordosica. The study provided a theoretical basis for the energy transformation and flow of the soil pool in sandy area.