自然稀疏 natural thinning 在个体密度非常高的植物群落中，由于对光、水和营养等条件的个体间的竞争，随着生长的进行，个体间的差异越来越大，处于劣势的个体逐渐枯死，随着群落的生长而个体的密度逐渐降低，此现象称为自然稀疏或自我稀疏（self thinning），它是群落所具有的自我调节机能之一。
经实测资料验证，笔者提出的模型在拟合光皮桦种群自然稀疏过程中，均具有较高的可信度。
According to the verified data, the model presented in this paper characterizes its higher credibility in the process of natural thinning of Betla Luminifera population.
对在无自然稀疏和有自然稀疏状况下有关植物群落的竞争密度效应的两个倒数方程的差异进行了理论分析。
The differences between the two reciprocal equations of the competition-density effect in nonself-thinning populations and self-thinning populations were analyzed theoretically.
叶腐病由腐霉属真菌的菌丝体危害所致，主要损害多年生黑麦草的叶片，影响植株分蘖，造成草坪自然稀疏。
Leaf mould was attacked by Fusarium nival, and had effect on perennial ryegrass's leaves and tillers, leading turf to become sparse.
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