Seasonal dynamics of nutrient accumulation and partitioning in the perennial C-4-grasses Miscanthus X giganteus and Spartina cynosuroides
Seasonal dynamics of nutrient accumulation and partitioning in the perennial C-4-grasses Miscanthus X giganteus and Spartina cynosuroides
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DOI：
10.1016/s0961-9534(97)00016-0
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发表时间：
1997-01-01
影响因子：
6
通讯作者：
Long, S. P.
中科院分区：
文献类型：
--
作者：
Beale, C. V.;Long, S. P.
氮素积累和分配的季节变化。测定了潜在能源作物芒草和大米草地上和地下干物质中的磷和钾。从经济和环境的角度来看，期望这样的作物应表现出高的养分利用效率和对环境的最小养分损失。在最后收获时，M地上部干物质中N、P和K的浓度分别为5.0、0.6和12.0 mg g-1。倍体小球藻和3.0、0.4和1.0 mg g ~（-1）。犬尾突这两个物种表现出高N-利用效率的C-4植物的预期。硝酸盐浸出可忽略不计。在生长季节结束时，营养物质被转移到根茎，在M。在落叶中被回收到土壤中。因此，作物的养分含量很低。计算了不同施肥量下，不同施肥量下的氮、磷、钾营养需求量。产生1.5 kg m-1干物质的地上收获物的倍半农作物将分别为9.2、1.3和20.4 g m-2。S. cynosuroides将是7.5，1.7和8.8 g m-2。除了M的K要求。两种作物对N、P、K的需求量均低于典型禾本科作物（包括玉米）。
Seasonal variation in the accumulation and partitioning of nitrogen. phosphorus and potassium was determined in both the above-ground and below-ground dry matter of the potential energy crops Miscanthus times giganteus and Spartina cynosuroides. It is desirable from both economic and environmental perspectives that such crops should exhibit a high nutrient use efficiency and minimal nutrient losses to the environment. The N, P and K concentrations in the above-ground dry matter, at final harvest, were 5.0, 0.6 and 12.0 mg g-1 respectively in M. times giganteus and 3.0, 0.4 and 1.0 mg g-1 in S. cynosuroicles. Both species exhibited the high N-use efficiency expected of C-4 plants. Nitrate leaching was negligible. At the end of the growing season, nutrients were translocated to the rhizomes and, in the case of M. times giganteus, recycled to the soil in shed leaves. Consequently the nutrient content of the crop offtake was low. It was calculated that the N, P and K requirements of a M. times giganteus crop producing an above-ground harvest of 1.5 kg m-1 dry matter would be 9.2, 1.3 and 20.4 g m-2 respectively. The corresponding nutrient requirements for S. cynosuroides would be 7.5, 1.7 and 8.8 g m-2. Except for the K requirement of M. times giganteus, the N, P and K demands of both species were less than those of typical graminaceous crops, including maize.