藏北高原高寒草甸地上生物量与气候因子的关系

采用收获法测量了藏北不同海拔高度(4300~4700m)2010年(6~8月)嵩草草甸群落地上总生物量,通过相关分析和多重回归分析法探讨了地上生物量与土壤温度、土壤含水量、空气温度、相对湿度、饱和水汽压亏缺以及比湿的关系。结果表明:总体而言,随着海拔高度的升高地上生物量逐渐增加,地上生物量与相对湿度、比湿以及土壤含水量分别呈极显著的正相关关系,与饱和水汽压亏缺呈极显著的负相关关系,而与土壤温度、空气温度呈不显著的负相关关系;相对湿度和饱和水汽压亏缺共同解释了地上生物量94%的变异,其中相对湿度的贡献较大。相对湿度是决定高寒嵩草草甸沿海拔分布的主导因子

Growth characteristics and production performance analysis of new scallop strain Zihaimo F_4

To assess the production performance of the scallop new strain Zihaimo and provide references for the breeding effect of the new strain,we conducted a research in the same sea area with the same management mode and breeding cycle.By comparing seven traits of scallop farming population including shell length (SL),shell height (SH),shell width (SB),body mass(BW),adductor muscle mass (AW) and shell mass (SW) and survival rate of the new strain Zihaimo F_4 with the Argopecten irradians concentricus,we analyzed their growth characteristics and production performance.The results indicate that the accumulated survival rate of Zihaimo F_4 was 51.32% when it was cultured from October 13~(th) to April 28~(th) of the next year,and the SL was from 1-1.5 mm to 50-60 mm,which was significantly greater than 29.18% of A.irradians concentricus (P<0.01).However,the SL,SH,SB and SW of the two cultivation groups in the same period had extremely significant differences(P<0.01).It is suggested that the growth rate of the new strain Zihaimo F_4 was higher than that of A.irradians concentricus.Compared with A.irradians concentricus,after 6.5 months of cultivation,the SL,SH,SB,BW and AW of the new strain Zihaimo F_4 increased by 19.50%,19.84%,16.23%,56.30% and 20.20%,respectively

黄土高原优良能源林植物选择的研究

针对我国农村能源短缺的现实，特别是黄土高原地区农村能源极度匮乏的现实，以农村可再生能源&mdash;生物质能(能源林)为主要对象，应用生态学的原理和先进的生物技术，采用综合特征指标，对黄土高原地区能源林植物进行试验，提出一套用综合特征指标(定量)选择能源林树种的标准和方法，以期为我国能源林的选择，规划以及黄土高原能源林的开发利用提供科学依据。五年来在宁南山区的彭阳县古城乡碱沟门、高湾村和草庙乡赵木湾村建立了试验基点，实行试验点与实验室结合、科研与生产结合，能源、生态与经济相结合的方法，完成和超额完成了项目规定的目标和主要技术指标(能源林树种产量指标为6～7.5吨/公顷)，建立试验林3，500亩，示范林35，000亩，选出优良能源林植物六种，并在宁南广大山区推广(18万亩)，取得了较好的能源、生态、经济的综合效益