High Mortality and Low Net Change in Live Woody Biomass of Karst Evergreen and Deciduous Broad-Leaved Mixed Forest in Southwestern China
High Mortality and Low Net Change in Live Woody Biomass of Karst Evergreen and Deciduous Broad-Leaved Mixed Forest in Southwestern China
复制标题
中国西南喀斯特常绿落叶阔叶混交林活木本生物量高死亡率和低净变化
DOI：
10.3390/f9050263
复制
发表时间：
2018-05-01
期刊：
影响因子：
2.9
通讯作者：
Zhang, Zhonghua
中科院分区：
文献类型：
--
作者：
Liu, Libin;Ni, Jian;Zhang, Zhonghua
基于大型永久性监测样地的重复观测是直观了解森林更新动态的重要方法。喀斯特森林在不利的生境中生长缓慢，具有特殊的更新模式。然而，没有数据可以支持这些属性，因为没有执行任何重复的观察。通过对贵州喀斯特常绿落叶阔叶混交林中国3a样地的短期连续监测，研究了喀斯特常绿落叶阔叶混交林活木本生物量的死亡、更新和净变化。在研究期间，胸径为1 cm的个体的物种丰富度从66下降到58。8个物种消失了，没有新的物种出现。个体数量从16,821个下降到15,003个，因为大多数物种显示的死亡人数多于招聘人数。乔木的死亡率最低，灌木的死亡率最高。个体死亡数随胸径级数的增加而减少。估计地上NPPlw为8.41t ha(-1)a(-1)年。幸存者、招募人数和死亡人数分别贡献了10.88、0.11和-2.58t ha(-1)年(-1)。主要贡献者是乔木(8.37t ha(-1)年)，而不是灌木(0.04t ha(-1)年(-1))和藤本植物(-0.004 t ha(-1)年(-1))。在中国亚热带和世界范围内，喀斯特森林的死亡率高于非喀斯特森林，NPPlw低于非喀斯特森林。
Repeated observation based on large permanent monitoring plots is a key method for directly understanding forest regeneration dynamics. Karst forests grow slowly in adverse habitats and possess a special regeneration mode. However, no data can support these properties because no repeated observations have been performed. The mortality, recruitment, and net change in live woody biomass (NPPlw) of a karst evergreen and deciduous broad-leaved mixed forest in Central Guizhou Province, Southwestern China, were studied on the basis of a short-term continuous monitoring (3 years) of a 2 ha plot. The species richness of individuals with a diameter at breast height (DBH) 1 cm decreased from 66 to 58 during the study period. Eight species disappeared, and no new species appeared. The individual number declined from 16,821 to 15,003 because most species indicated more deaths than recruitments. Trees presented the lowest mortality rate, and shrubs presented the highest recruitment rate among the species. Individual death number decreased with the increase in DBH classes. The estimated aboveground NPPlw was 8.41 t ha(-1) year(-1). The survivors, recruitments, and deaths contributed 10.88, 0.11, and -2.58 t ha(-1) year(-1), respectively. Trees (8.37 t ha(-1) year(-1)), rather than shrubs (0.04 t ha(-1) year(-1)) and lianas (-0.004 t ha(-1) year(-1)), were the major contributors. The karst forest presented higher mortality and lower NPPlw than nonkarst forests in subtropical China and in the world.