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ZHAO Chang1, LONG Jian1*, LI Juan2, LIAO Hong-kai1, LIU Ling-fei1, ZHANG Ming-jiang1, HUA jian1
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Abstract: In the present study, we selected forest floor litters from three slope directions inMaolan Karst primary forest to investigate the distribution characteristics of litter stock, nutrientcontents (C, N, P and K) and their release rates of different decomposing layers. The results showed that: (1) Total litter stock was higher in north slope (0.568 kg·m-2) than that in south slope (0.504 kg·m-2) and northeast slope (0.295 kg·m-2). Litter stocks in different layers arranged in the order of fresh litter layer (layer L>fragmented litter layer (layer F) > fullydecomposed layer (layer Y); (2) The C and K contents in different decomposing layers were in the order of layer L>layer F>layer Y, whereas the N and P contents were followed by the order of layer Y> layer F> layer L. (3) Total storage of litter C, N and K was in the order of north slope>south slope>northeast slope, and total litter P storage was the highest in the south slope, followed by north slope, and then the northeast slope. (4) The litter nutrient storage in layer Laccounted for 37.1% to 64.2% of the total nutrient storage, showing a decrease trend with theincreases of decomposition degrees. The release rates of the nutrient elements in layers L and F were the highest in the north slope, followed by the northeast slope and the south slope.Moreover, the release rates of C and K were higher than that of N and P. Our results indicated that the slope direction had a great influence on the chemical properties and decomposition rate oflitters. In general, litters in the north slope decomposed rapidly and the cycling time of nutrient elements was shorter than that in other slopes in the Karst primary forest.
Key words: harvested site, Larix olgensis plantation, combustion experiment, soil temperature field
ZHAO Chang, LONG Jian, LI Juan, LIAO Hong-kai, LIU Ling-fei, ZHANG Ming-jiang, HUA jian. Litter stock and nutrient characteristics of decomposing litter layers in Maolan Karstprimary forest in different slope directions.[J]. cje.
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URL: https://www.cje.net.cn/EN/abstract/abstract23071.shtml
https://www.cje.net.cn/EN/Y2018/V37/I2/296