ECOLOGICAL OPTIMALITY IN WATER-LIMITED NATURAL SOIL-VEGETATION SYSTEMS .1. THEORY AND HYPOTHESIS
ECOLOGICAL OPTIMALITY IN WATER-LIMITED NATURAL SOIL-VEGETATION SYSTEMS .1. THEORY AND HYPOTHESIS
复制标题
DOI：
10.1029/wr018i002p00325
复制
发表时间：
1982-01-01
影响因子：
5.4
通讯作者：
EAGLESON, PS
中科院分区：
文献类型：
--
作者：
EAGLESON, PS
本文给出了考虑土壤和植被水文参数的年平均水量平衡近似统计动力模型的解空间。在该模型的精度范围内，当冠层密度和物种的作用使平均需水量压力最小化时，有限水的自然植被系统与其气候和土壤环境处于稳定的平衡状态。理论表明，这种平衡有一个气候极限，在这个极限之上，假设生态压力是朝向生物量生产力最大化。进一步假设，自然土壤-植被系统将通过植被引起的土壤结构变化，逐步协同发展，朝着在给定气候下给定物种的最小应力冠层密度最大的一组水力土壤性质发展。利用这些假设，只需要知道土壤的有效孔隙度，就可以确定给定气候下的最佳土壤和植被参数。
The solution space of an approximate statistical-dynamic model of the average annual water balance is expored with respect to the hydrologic parameters of both soil and vegetation. Within the accuracy of this model it is shown that water-limited natural vegetation systems are in stable equilibrium with their climatic and pedologic environments when the canopy density and species act to minimize average water demand stress. Theory shows a climatic limit to this equilibrium above which it is hypothesized that ecological pressure is toward maximization of biomass productivity. It is further hypothesized that natural soil-vegetation systems will develop gradually and synergistically, through vegetation-induced changes in soil structure, toward a set of hydraulic soil properties for which the minimum stress canopy density of a given species is maximum in a given climate. Using these hypotheses, only the soil effective porosity need be known to determine the optimum soil and vegetation parameters in a given climate.