Effects of Phosphorus Nutrition and Defoliation on C4 Graminoids from the Serengeti Plains
Effects of Phosphorus Nutrition and Defoliation on C4 Graminoids from the Serengeti Plains
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DOI：
10.2307/1938024
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发表时间：
1985-10
期刊：
影响因子：
4.8
通讯作者：
S. McNaughton;F. Chapin
中科院分区：
文献类型：
--
作者：
S. McNaughton;F. Chapin
Kyllinga nervosa（莎草科）和马唐（禾本科），C4 禾本科植物，获自坦桑尼亚塞伦盖蒂国家公园。基林加在高 pH、高钙、低磷、碳酸盐灰衍生的土壤中最为丰富，而马唐在中性、低钙、高磷土壤中更为丰富。这两个物种都来自密集放牧的草原。测量植物对不同营养水平和落叶的反应，以评估放牧生态系统中能量和养分流之间潜在的限制性相互作用。植物在磷浓度为 10 和 100 μmol/L 的溶液中水培生长，每周不修剪或修剪至 3 cm 高度，持续 5 周。此时，用 32P 测量磷吸收动力学，收获植物，测定干质量以及 P 和 N 的组织浓度。生长培养基的修剪和磷浓度均对所有植物成分的产量产生重大影响。 Kyllinga 的总产量最高...
Kyllinga nervosa (Cyperaceae) and Digitaria macroblephara (Poaceae), C4 graminoids, were obtained from the Serengeti National Park of Tanzania. Kyllinga is most abundant on high pH, high calcium, low phosphorous, carbonatitic ash—derived soils, and Digitaria is more abundant on neutral, lower calcium, higher P soils. Both species come from intensely grazed grasslands. Plant responses to different nutritional levels and defoliation were measured to evaluate potential limiting interactions between energy and nutrient flows in grazing ecosystems. Plants were grown hydroponically at solution phosphorus concentrations of 10 and 100 μmol/L and were either unclipped or clipped weekly to a height of 3 cm for 5 wk. At that time, the kinetics of P uptake were measured with 32P, plants were harvested, and dry masses and the tissue concentrations of P and N were determined. Clipping and P concentration of the growth medium both had major effects upon yields of all plant components. Total yield of Kyllinga was highest...