滇东喀斯特地区季节性石漠化与植被盖度的动态关系研究

对滇东喀斯特石漠化地区12种植被类型进行了石漠化率和植被盖度的季相观测,研究结果显示:封育模式草本阶段(≤3a)、草灌阶段(≤5a)和灌草阶段(≤10a),麻栎纯林(20～30a),混交模式的华山松+麻栎(20～30a和≥30a)、麻栎+大叶栎(≥30a)7种模式的季节性石漠化率与植被盖度此消彼长的关系同时同步发生,关系曲线为"V"字型。封育乔灌阶段(10～20a),华山松纯林(20～30a)和华山松+刺栎(≥30a)混交林的消长关系同时同步出现,前两种模式为"N"字线型,华山松+刺栎为台地线型。封育乔木(20～30a)阶段为消长关系同时同步出现的"N"字线型,滇青冈+刺栎(≥30a)模式的石漠化率与盖度无消长关系。除个别模式由于林龄、树种、配置方式的差异外,其余模式均符合季节性石漠化率与植被盖度的消长关系,线型略有不同。

Research on Dynamic Relationship of Seasonal Rocky Desertification and Vegetation Coverage in the Karst Area of Eastern Yunnan

Through the seasonal observations with the rate of rock desertification and vegetation cover for these 12 vegetation types at karst rocky desertification area in the eastern Yunnan. The results showed that:The counter-balance relationship between seasonal rate of rock desertification and vegetation cover while simultaneously occur for herbal stage (≤3 a),grass-shrub stage (≤5 a),shrub-grass stage (≤10 a),tree stage (20~30 a) of cultivating mode; sawtooth oak pure forest (20~30 a);armand pine+sawtooth oak(two kinds of 20~30 a and≥30 a),sawtooth oaK~+griffith oak (≥130 a) of mixed forest model, relationship curve as"V"shaped. The counter-balance relationship of tree-shrub stage (10~20 a)of cultivating mode, armand pine pure forest (20~30 a) and armand pine+thorn oak (≥30 a) of mixed forest model while simultaneously occur, the first two modes for "N"type, armand pine+thorn oak likes platform linear. Tree stage (20~30 a)of cultivating rood as "N"type is while simultaneously occur. The rate of rock desertification and vegetation cover for Yunnan quercus glauca oaK~+thorn oak (≥t30 a) is no growth-decline relationship. And at the same time, due to the differences of the forest age, tree species, configuration, there are also some models are synchronized between of them, slightly different for linear.