马尾松人工林凋落物分解及养分释放规律

1995～ 1 999年在福建省洋口林场开展了马尾松凋落物收集和分解试验 ,结果表明 :不同坡位马尾松人工林的凋落量和凋落物养分积累量差异明显 ,凋落量叶 >枝 >皮 >球果 ,凋落物养分积累量 N>Ca>K>Mg>P;凋落物前期分解比较快 ,后期分解趋于缓和 ,凋落物的分解与气候因子密切相关 ,凋落物的失重率与时间之间遵循 W=2 3.1 2 3t0 .50 0 2 ( r=0 .98)的幂函数关系 ,凋落物 N、P的浓度随着分解时间的推进逐渐增加 ,K、Ca、Mg则正好相反 ,凋落物的养分释放速率 K>Mg>Ca>P>N,凋落物中 N的释放量最大 ,其次是 K、 Ca,P、 Mg的释放量最小

Laws of Litter-fall Decomposition and Nutrient Release in the Pinus massoniana Plantation Ecosystem

To probe the rule of litter fall decomposition and nutrient release of Pinus massoniana plantation ecosystem,a trial about collecting and decomposing litter fall was carried at the Yangcou state forestry farm of Fujiang province in 1995～1999 The results show that the litter fall decomposition and nutrient accumulation at various slope site are marked difference,and the amount of litter fall from leaf>branch>bark>cone,nutrient accumulation from litter fall N>Ca> K> Mg> P Decomposed speed of litter fall in early days is faster than in later period,and is evidently related with weather factor Relation between weightlessness rate of litter fall and time abides by power series W=23 123 t 0 500 2 (r= 0 98) Consistency of N,P in litter fall is increased by time,contrarily K?Ca?Mg The order of releasing speeds of litter fall is K> Mg> Ca>P>N,with N greatest,and then K?Ca,P?Mg smallest