关键词: 沙地柏, 养分分配, 养分利用效率, 养分重吸收效率, 养分内循环, 异质性

Abstract:

To ask adaptive responses of the S.vulgaris plants to different nutrient regimes in the fixed sandland, shifting sandland, and lowland in the poor nutrient Mu Us Sandland, the authors analyzed the following characteristics:soil nutrient regimes, biomass and nutrient allocation to various parts in the species growing in the contrasting haditats, nutrient use efficiency and resorption efficiency. The results were shown as follows:(1)there were differences in the contents of nitrogen (N), phosphorus (P), potassium (K), calcium(Ca), and magnesium (Mg) in the three habitats to various extents;(2)the ratios of biomass, N and P allocated to the leaves increased with the decreasing of soil N and P contents, these ratios allocated to the roots followed the opposite direction;(3)N and P resorption efficiencies, K use efficiency and resorption efficiency, and Ca and Mg use efficiencies increased with the decreasing of the corresponding soil nutrient contents, while N and P use efficiencies decreased with the decreasing of soil nutrient availability;(4)the contribution of the leaves to nutrient internal cycling was opposite with that of the roots to nutrient internal cycling; (5)root distribution exhibited various influences on heterogeneity of different soil nutrients.

Key words: Sabina vulgaris, Nuutrient allocation, Nutrient use efficiency, Nutrient resorption efficiency, Nutrient internal cycling, Nutrient heterogeneity