侧柏-山毛桃混交林枯落物分解动态与养分归还的研究  

Study on litter decomposition dynamics and nutrient return in the mixed forest of Platycladus orientalis and Prunus davidiana

作　　者：吴明[1] 赵佳宝[1] 孔玉华[1] 张盼盼[1] 杨喜田[1] 常海荣[1] 王怡博 

机构地区：[1]河南农业大学林学院,河南郑州450002

出　　处：《河南农业大学学报》2015年第3期320-324,330,共6页Journal of Henan Agricultural University

基　　金：国家自然科学基金项目(31170580)

摘　　要：以黄河小浪底库区内10 a生的侧柏、山毛桃纯林及侧柏-山毛桃混交林为研究对象,采用枯落物分解袋法对其枯落物的季节分解动态与养分归还进行分析。结果表明：（1）在气温高、降水多的5-11月,3种林分下枯落物的失重率变化较大,在气温低、降水较少的11月到次年3月,枯落物失重率变化较为平缓。不同林分间枯落物的分解速率大小顺序为：山毛桃纯林〉侧柏-山毛桃混交林〉侧柏纯林;（2）枯落物养分含量的变化趋势呈现出：N含量先升后降,为富集-释放的模式;P含量持续升高,出现富集现象;K含量不断下降,为直接释放的模式;（3）N、P、K在3种林分中的年归还量大小顺序分别为：侧柏-山毛桃混交林〉山毛桃纯林〉侧柏纯林;侧柏-山毛桃混交林〉侧柏纯林〉山毛桃纯林;山毛桃纯林〉侧柏-山毛桃混交林〉侧柏纯林。相对于纯林,侧柏-山毛桃混交林有利于提高枯落物的分解速率,显著增加N和P的归还量（P〈0.05）。10-year old of Platycladus orientalis and Prunus davidiana mixed forest was selected as the research subject in the Yellow River Xiaolangdi reservoir. And the litter bag method was used to analyze the seasonal dynamics of litter decomposition and nutrient return. The results showed that： （1） the dynamics of the weightlessness rate for all three kinds of litter types were sharp during May to November because of higher temperature and large amount of precipitation. On the contrary, within the lower temperature and precipitation amount during November to March, its dynamic trend was gentle. Further more, the decomposition rates in different litter types showed the following order： Prunus davidiana litter 〉 Platycladus orientalis-Prunus davidiana mixed litters 〉 Platycladus Orientalis litter; （2） the litter nutrient content presented that： with the litter decomposition, the litter N content tend to increase and then decrease, showing the pattern of enrichment-release; while the P concentration in litter rose continually with the enrichment pattern; the K content showed the decrease trends from the beginning to the end under the release pattern; （3） the yearly nutrient return amounts in three kinds of forests showed the following order ; Platycladus Orientalis 〉 Prunus davidiana 〉 Platycladus orientalisPrunus davidiana mixed forest for the N return amount; Platycladus orientalis-Prunus davidiana mixed forest 〉 Platycladus Orientalis 〉 Prunus davidiana for the P return amount; Prunus davidiana 〉 Platycladus orientalis-Prunus davidiana mixed forest 〉 Platycladus Orientalis for the K return amount. The mixed forest type could significantly increase the litter decomposition rates and N/P return amounts compared with the pure forest type （P 〈 0. 05 ）.

关 键 词：侧柏 山毛桃 枯落物分解 养分归还 

分 类 号：S718[农业科学—林学]