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YANG Li-xue1**, SUN Yue-zhi2
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Abstract: Taking 16-, 23-, and 51 years old Manchurian walnut (Juglans mandshurica) plantations at Maoershan of Heilongjiang Province, Northeast China as test objects, and with the consideration of allelochemicals, this paper studied the differences in the understory vegetation biodiversity among the plantations. With the increasing age of the plantations, the understory shrub richness index (IMa), diversity index (Isw), and Pielou evenness index (J) all presented an increasing trend, while the understory herb IMa and Isw were decreasing, and the herb species number decreased from 14 to 10. The most important plant species in the differentaged plantations were Rubus kanayamensis, Erigeron annuus, Taraxacum officinale, and Potentilla centigrana in 16 years old plantation, Ulmus japonica, Syringare ticulata, and Diarrhena manshurica in 23 years old plantation, and Syringare ticulata, Hippochaete hiemale, and Brachybotrys paridiformis in 51 years old plantation. The plant biodiversity of the plantations was less affected by juglone, but the understory shrub biodiversity was more affected by soil available P and K. The understory shrubs and herbs adapted differently to various soil pH ranges. Other soil factors such as bulk density, moisture content, organic matter, and total N had opposite effects on the biodiversity of understory shrubs and herbs.
Key words: agroforestry system, carbon storage, carbon sequestration, structure optimization, climate change.
YANG Li-xue1**, SUN Yue-zhi2. Biodiversity of understory vegetation in different-aged Manchurian walnut plantations.[J]. cje.
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URL: https://www.cje.net.cn/EN/abstract/abstract19775.shtml
https://www.cje.net.cn/EN/Y2013/V32/I4/807