Abstract: Presbytis leucocephalus is an endemic species only found in China. Its habitats are quite narrow and disperse. In Guangxi Zhuang Autonomous Region, the “karst rocky mountain” landscape composed of many kinds of limestone and special limestone monsoon forest or secondary vegetation is a typical tropical karst geomorphologic assemblage of clusterpeak depression and cluster valley, and different from the “earthy mountain” landscape around. Environmental heterogeneity and uncontinuity make the “karst rocky mountain” landscape become isolated and homogeneous patches with clear boundaries, being able to provide critical living space for P. leucocephalus in cave and groupliving. P. leucocephalus is a species adaptable to tropical climate, good at climbing, phytophagy, and caveliving. It chooses low karst clusterpeak depression and cluster valley as its suitable habitat, which is the result of its ecological adaptation in its longterm evolution process. At present, P. leucocephalus only distributes in several isolated areas. In recent decades, due to the intense disturbance of human activities, the habitat size of P. leucocephalus reduces rapidly, and the habitat distribution becomes much more disperse. Only by properly handling the manland relationship and the manwild animal relationship, forbidding the overexploitation of “karst rock mountain” areas, and maintaining the integrity and landscape heterogeneity of this natural complex, can P. leucocephalus have the survival possibility and development opportunity.

Key words: Crocus sativus, Potassium, Expansion of corms, Physiological and ecological effects