SPECIES RICHNESS–PRODUCTIVITY PATTERNS DIFFER BETWEEN N‐, P‐, AND K‐LIMITED WETLANDS
SPECIES RICHNESS–PRODUCTIVITY PATTERNS DIFFER BETWEEN N‐, P‐, AND K‐LIMITED WETLANDS
复制标题
DOI：
10.1890/01-0639
复制
发表时间：
2003-08
期刊：
影响因子：
4.8
通讯作者：
H. O. Venterink;M. Wassen;A. Verkroost;P. C. Ruiter
中科院分区：
文献类型：
--
作者：
H. O. Venterink;M. Wassen;A. Verkroost;P. C. Ruiter
我们评估了营养限制（N，P或K）是否可能影响物种丰富度生产力模式，并随后可能解释物种丰富度和受威胁物种丰富度的变化。我们提出了一个数据集，从以前的研究在波兰，比利时和荷兰的湿地和研究物种丰富度生产力模式的维管植物在所有150个网站一起，以及为N-，P-和K-有限的网站分别。通过N：P、N：K和K：P比值评价了植被的养分限制类型。这些比率的临界值来自施肥实验的文献综述。在我们的150个站点中，这种营养限制通过生产力的巨大差异影响物种丰富度-生产力模式。P（co）限制只发生在低生产力下，K（co）限制直到中等生产力，N限制沿着整个生产力梯度。随着生产力的提高，K（co）限制样地的物种丰富度呈下降趋势，而N（co）限制样地和P（co）限制样地的物种丰富度均呈“填充驼峰”曲线。受威胁物种的物种丰富度-生产力关系的范围比所有物种的生产力范围窄得多。受威胁的物种的丰富度较高，在P（CO）有限的网站比在N有限的网站，这表明在湿地中的P的可用性增加可能是特别重要的，在西欧造成受威胁的物种消失。养分限制在物种丰富度-生产力关系中的作用不仅揭示了可能解释物种丰富度变化和受威胁物种发生的机制，而且对自然管理实践也很重要。
We evaluated whether the kind of nutrient limitation (N, P, or K) may affect species richness–productivity patterns and subsequently may explain variation in species richness and in richness of threatened species. We present a data set from previous studies in wetlands in Poland, Belgium, and The Netherlands and examine species richness–productivity patterns for vascular plants in all 150 sites together as well as for N-, P-, and K-limited sites separately. The kind of nutrient limitation was assessed by N:P, N:K, and K:P ratios in the vegetation. Critical values for these ratios were derived from a literature review of fertilization experiments. The kind of nutrient limitation influenced species richness–productivity patterns in our 150 sites through large differences in productivity. P (co)-limitation occurred only at low productivity, K (co)-limitation up to intermediate productivity, and N limitation along the entire productivity gradient. There was a decreasing trend in species richness with increasing productivity for K (co)-limited sites, whereas for both the N-limited sites and P (co)-limited sites a sort of “filled hump-shaped curve” was observed. The species richness–productivity relationship for threatened species was restricted to a much narrower productivity range than that for all species. Richness of threatened species was higher in P (co)-limited sites than in N-limited sites, suggesting that increased P availabilities in wetlands may be particularly important in causing disappearance of threatened species in western Europe. The role of nutrient limitation in species richness–productivity relationships not only reveals mechanisms that may explain variation in species richness and occurrence of threatened species, but it also may be important for nature management practice.