水曲柳人工林凋落物分解及其N、P、K养分归还

Litter Decomposition and Nutrients(N,P,K)Return in Manchurian Ash Plantation Forest

采用埋袋法研究了水曲柳(17年生)两种不同来源凋落物(地下部分死亡的细根和地上部分落叶)的分解。结果表明,细根的年分解量为663.3kg.hm-2,占到凋落物年分解总量的29.5%。细根N、P、K养分归还量分别是凋落物总归还量的72.7%、34.5%、39.1%。由此可见,细根在林地C和养分循环中占重要地位。

Decomposition of fine root (≤2 mm) and leaves litter in an manchurian ash (Fraxinus mandshurica Rupr.)stand (17 year-old)was measured using buried litterbags methods.The results showed that fine root annual decomposition amount was 663.3 kg·hm^(–2),and may contribute 29.5% to the total litter decomposition.Amount of N,P and K return to soil from fine roots was 72.7%,34.5%,39.1% of total return amount.Fine roots make a substantial contribution to soil organic matter and play an important role in nutrient cycling in forest ecosystems.