不同發(fā)育階段杉木人工林土壤團(tuán)聚體分布特征及其穩(wěn)定性研究
[Abstract]:In order to study the distribution and stability of soil aggregates in Chinese fir plantation and to explore the soil structure of Chinese fir plantation, the composition of soil aggregates in 0-100cm soil layer of Cunninghamia lanceolata plantation at different development stages was determined by dry sieving method. The stability of aggregates was determined by wet sieving method. The results showed that the soil aggregates of Chinese fir plantation were mainly macroaggregates (0.25mm) under dry sieving treatment, and the proportion of macroaggregates was more than 80%. The ratio of soil macroaggregates in middle-aged forest and mature forest was higher than that in young forest in each soil layer, and the difference in 0-20cm soil layer was significant (P0.05). In different soil layers, the proportion of soil aggregates with 5mm particle size in different development stages of Cunninghamia lanceolata plantation was higher, and the composition ratio of soil aggregates with 5mm particle size was significantly influenced by different developmental stages of Cunninghamia lanceolata plantation. Under wet screen treatment, the ratio of water-stable macroaggregates (0.25mm) decreased significantly with the deepening of soil layer, and the ratio of water-stable aggregates in middle-aged forest and mature forest was higher than that in young forest in each layer of 0-80cm, and the percentage of water-stable aggregate in middle-aged and mature forest was higher than that in young forest. Moreover, in 0-20cm and 20-40cm soil layers, the age forest was 41.79% and 39.06% higher than that of the young forest, respectively, and the difference was significant. The (PAD) characteristics of soil aggregate failure rate of Cunninghamia lanceolata plantation at different development stages were opposite to those of water-stable macroaggregates. The mean weight diameter (MWD) and the average geometric diameter (GMD) decreased significantly with the deepening of soil layer, and the GMD of soil aggregates in the aged and mature forests was significantly higher than that in the young ones in all soil layers of 0-100cm. It was concluded that the soil aggregate stability of Chinese fir plantation decreased with the deepening of soil layer, and the soil structure of middle-aged forest and mature forest was better than that of young forest.
【作者單位】: 福建農(nóng)林大學(xué)林學(xué)院;國(guó)家林業(yè)局杉木工程技術(shù)研究中心;
【基金】:國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFD0600301) 福建農(nóng)林大學(xué)科技創(chuàng)新專(zhuān)項(xiàng)(KF2015034)
【分類(lèi)號(hào)】:S714.2
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