凋落叶养分动态的起伏型时间序列分析

Analysis of leaves nutrient dynamics by wave-type time series method

凋落物分解归还的养分能够满足森林植物生长的大部分需要,其中凋落叶分解所释放的养分是森林生态系统养分循环的重要组成部分。N、P、K是植物生长发育不可缺少的营养元素,对促进林木生长,提高林业生产力有很大作用。对闽楠、樟树、竹柏、池杉凋落叶N、P、K的释放动态的初步分析。结果表明,3种元素在分解过程都出现不同程度的富集,除闽楠凋落叶的元素基本呈释放状态外,其它3种凋落叶的养分大都呈富集现象,其中N、P以富集为主,K以淋溶释放为主。总之,3种营养元素含量及释放量在分解过程中随时间而波动。因此,本研究应用起伏型时间序列法对其动态进行模拟,模拟结果比较理想,说明该方法可应用于凋落物分解过程养分动态的研究。

Litter-fall decomposition provided the most nutrients needed by forest growth, and the nutrient released by leaf-litter decomposition was an important part of nutrient cycle in forest ecosystem. Nitrogen, phosphorus and kalium which are the indispen- sable nutrient dements in forest growth played a very important role in improving forest productivity. The dynamics of 3 main nutri- ent elements releases were analyzed among Phoebe bournei, Cinnamomum camphora, Podocarpurs nagi, Taxodium ascendens. The result showed that the 3 elements showed different enrichment during decomposing process. During decomposing process, except Phoebe bournei leaf-litter＇s elements were almost in releasing state, other 3 leaves litter＇s elements were almost in enrichment state, and nitrogen and phosphorus were almost in enrichment state, but kalium was in releasing state. In conclusion, the change of 3 main nutrient elements concentration and release fluctuated by the time during decomposing process. So, wave-type time series method was used to simulate the dynamics of 3 main nutrient dements, and the simulated results were good which indicated that the method could be applied to the study of nutrients dynamics in the litter-fall＇s decomposing process.