综述森林萌生更新形成的6种假说：生物地理假说、生境假说、营养假说、干扰假说、资源分配假说和激素调控假说，并指出今后应加强森林萌生更新的群落生态学和生理生态适应性研究，以及萌生更新在森林植被恢复和生态重建中的应用研究。
Sprouting is a part of the“regeneration niche”and a highly evolutionarily labile trait for plants．Sprout regeneration is an efficient mechanism for forest regeneration to regain lost biomass after disturbances，and has the important ecological function in regulating individual life history strategies of plants，and restoring secondary vegetation following intense disturbances，as well as maintaining species composition and structure of community．Sprouting is a complex ecophysiological process．The sprouting ability of plant is not only affected by its exterior habitat，disturbances and resources level，but also controlled by its interior nutrient level and hormone situation．This paper reviewed six hypotheses on the mechanism of sprout formation．The biogeographic hypothesis suggests that different biogeographic communities have different number of sprouters，and there are more sprouters in tropical forest sites than that in temperate sites．The habitat hypothesis indicates that trees in different environment have different resprouting ability．And the nutrition hypothesis considers that the soil，the coarse roots and the taproots are the main nutrient sources for sprouting．From the viewpoint of disturbance hypothesis，disturbance types，intensity and frequency are usually considered to be the important determinant of resprouting in woody communities．The resource allocation hypothesis states that resprouting requires resources for supporting sprout after disturbances such as fire or cutting．Resprouting ability is regulated by level of hormone in tree，and auxins (IAA) and cytokinins are two groups of growth regulators to promote development of stem buds and shoots in the light of hormone regulating hypothesis．Finally，some propositions in this research field were made to offer the references for further studies．
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