余甘子果实采收期长于多数水果，留树越冬落果率低，采后余甘子果实失重率、腐烂率高，容易发生褐变，所以果实的贮藏保鲜成为了余甘子加工行业的关键问题，试验选取包装、预处理方式以及贮藏温度对采后余甘子果进行贮藏工艺的研究。结果表明：冷激处理并且真空包装，贮藏温度为4℃条件下，余甘子果实的失重率为0，含水率保持在81.5%左右，贮藏时间达到70 d，理化性质变化较小，Vc和还原糖等营养成分得到较好保留，无胀袋现象，为余甘子果的贮藏提供理论参考。

The antioxidant activities in vitro of refined powder of Phyllanthus emblica L. were detected by methods based on chemical measurement and cell modeling. The results of anti-peroxidation ability and iron reduction ability trials showed that the refined powder of P. emblica L. had strong ability of anti-peroxidation, and it increased with the increasing of concentration with a clear dose-response relationship. When the concentration reached 800 μg·mL-1, the ability of anti-peroxidation was almost equal to the positive control VC with the same concentration. Meanwhile, it also had iron reduction ability that accompanied by significant dose-response relationship. By in vitro cell culture method, H2O2 was used to induce SH-SY5Y cells damages to establish the cell model of oxidative damage. The author detected the effect of different concentrations of powder on cell survival rate for the model cells by MTT assay. The results indicated that refined powder could show better protective effect to oxidative damaged SH-SY5Y cells in the range of 600 1 200 μg·mL-1. When the concentration reached 1 200 μg·mL-1, the cell survival rate was the highest and refined powder exhibited the best antioxidant activity. Both methods proved the strong antioxidant activities of refined powder of P. emblica L. in vitro.

目的 探讨不同间伐强度对林木生长的影响并找出影响林分生长的关键土壤因子。 方法 在山西省沁源县好地方林场华北落叶松人工林设置12块抚育间伐试验样地，开展轻度（间伐强度15%）、中度（间伐强度35%）、重度（间伐强度50%）抚育间伐并设置对照样地，以树木平均胸径、平均树高、平均枝下高、平均冠幅、乔木层生物量与生产力为林木生长指标，利用方差分析与多重比较分析不同间伐强度林分生长特征，结合土壤因子运用相关性分析研究林木生长量与土壤因子的关系。 结果 表明：华北落叶松人工林经中度、重度间伐2年与4年后，各树木生长指标与对照样地相比均显著增加；间伐在减少林分内乔木层生物量的同时能显著提高乔木层生产力，各时间段及间伐强度下乔木层生产力均表现为重度>中度>轻度>对照；间伐可提高土壤有机碳（SOC）、土壤全氮（TN）、土壤全磷（TP）含量，减缓土壤养分的流失；华北落叶松人工林平均胸径生长量与SOC、TN呈显著正相关，平均冠幅生长量与土壤含水率（MC）、SOC、TN、TP显著正相关。 结论 间伐可促进华北落叶松人工林单株林木胸径和冠幅生长，增大林木单株冠径比与生产力，在本研究的3个间伐强度中，50%的重度间伐是最适间伐强度。华北落叶松人工林内土壤有机碳与土壤全氮含量较为丰富，土壤全磷含量较少，土壤pH为弱酸性，SOC、TN、TP是影响华北落叶松人工林生长的重要土壤因子。