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通过长期野外监测和分析,研究了金沙江干热河谷罗望子人工林凋落物分解和养分释放动态,结果表明:经过420d分解期,林地A和林地B的凋落物残留率为42.57%和29.22%,半衰期为0.87a和0.75a,周转期为4.81a和3.61a;养分迁移方式,K元素是淋溶-富集-释放;N、Ca、Mg、Cu元素是富集-释放,Fe元素是富集,P元素在林地A和林地B中迁移方式略有差异;养分释放特征,P、Ca、Mg元素表现为净释放,七种元素释放率大小,林地A和林地B均为:Ca﹥K﹥P﹥Mg﹥N﹥Cu﹥Fe;P、K、Ca、Mg元素易分解和循环,返回林地时间较短,易被林木吸收。罗望子林凋落物的分解总体特征符合亚热带气候的地带性特点,受气温和降雨量影响较小。
Through long-term field monitoring and analysis, the dynamics of litterfall decomposition and nutrient release in the tamarind plantation of Jinshanjiang dry-hot valley was studied. The results showed that the litterfall of the forestland A and woodland B was 42.57% and 29.22% after 420 days of decomposition, Half-life of 0.87a and 0.75a, turnover of 4.81a and 3.61a; nutrient migration, K element is leaching - enrichment - release; N, Ca, Mg, Cu element is enriched - release, The results showed that there was a slight difference in the migration patterns between P and P elements in woodland A and woodland B. The characteristics of nutrient release, P, Ca and Mg were net release and the release rates of seven elements were the same. P> Mg> N> Cu> Fe; P, K, Ca, Mg are easy to decompose and recycle, and return to the forestland for a short time and are easily absorbed by the forest. The general characteristics of litter decomposition in tamarind forest are in accordance with the zonal characteristics of subtropical climate and are less affected by temperature and rainfall.