立竹密度调控对雷竹林下黄精生长及药用价值的影响

Effects of Phyllostachys praecox Density on the Growth and Medicinal Value of Polygonatum sibiricum

为优化雷竹-黄精复合经营中的立竹密度,以粗放经营的雷竹林为试验区域,设置3种立竹密度,D1(6 000~9 000株·hm^(-2))、D2(9 000~12 000株·hm^(-2))和D3(12 000~15 000株·hm^(-2)),分析了三种立竹密度对黄精的生长发育、生物量积累以及块茎药用价值的影响。研究结果表明:3种立竹密度对黄精的株高、地径、生物量、叶绿素含量以及叶片相对性状均产生了不同程度的影响。在D1密度下,黄精地上部和地下部生物量最大,叶片干物质含量最高,地上及地下部折干率最高;另一方面,3种立竹密度下,黄精总多糖含量和黄精总皂苷含量无显著差异。这项研究阐明立竹密度是影响雷竹林下黄精生长的重要因素,雷竹-黄精复合经营适宜的立竹密度为6 000~9 000株·hm^(-2)。

In order to explore the optimal Phyllostachys praecox density in Phyllostachys praecox-Polygonatum sibiricum intercropping models, three kinds of bamboo density: low density D1(6000~9000 stems·hm^(-2)), medium density D2(9000~12000 stems·hm^(-2)) and high density D3(12000~15000 stems·hm^(-2)) were set in the extensive management of Phyllostachys praecox forest as the test area, and the effects of these three different bamboo density on the growth and development, biomass accumulation and the medicinal value of Polygonatum sibiricum were analyzed.The results showed that the three bamboo densities had different effets on the plant height, ground diameter, biomass,chlorophyll content and leaf relative characteristics of Polygonatum sibiricum. Under D1 density, the aboveground and belowground biomass of Polygonatum sibiricum was the largest, the dry matter content of leaves was the highest, and the dryness rate of aboveground and underground parts was the largest. Meanwhile, there was no significant difference in the total polysaccharide content of Polygonatum sibiricum and the total saponin content of Polygonatum sibiricum under the three bamboo densities. This study clarifies that the bamboo density is an important factor affecting the growth of Polygonatum sibiricum under the Phyllostachys praecox forest, and the suitable bamboo density for the combined management of Phyllostachys praecox-Polygonatum sibiricum is 6000~9000 stems·hm^(-2).