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近10年来我国松脂资源的动态变化——基于“连清”数据的动态评估 被引量:7
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作者 董静曦 郭辉军 +2 位作者 张子翼 吴霞 黄甫则 《林业科学》 EI CAS CSCD 北大核心 2016年第12期112-122,共11页
【目的】研究近年来我国松脂资源的动态变化及发展趋势,分析论证松脂资源变化的原因和存在的问题,以期为我国松香产业发展提供基础资源数据。【方法】基于已经公布的2002和2012年全国森林资源连续清查数据,采用"径级株数法"... 【目的】研究近年来我国松脂资源的动态变化及发展趋势,分析论证松脂资源变化的原因和存在的问题,以期为我国松香产业发展提供基础资源数据。【方法】基于已经公布的2002和2012年全国森林资源连续清查数据,采用"径级株数法"对我国采脂松树资源和松脂贮量进行计算估测分析。【结果】目前我国成规模的采脂松有马尾松、云南松、思茅松和湿地松4个树种,林分面积和蓄积分别为985.5万hm^2、5.821 2万m^3,447.8万hm^2、4.947 5亿m^3,55.8万hm^2、5 982万m^3,10.5万hm^2、515万m^3。全国可采脂松树总面积为1 499.6万hm^2,较2002年减少33.2%;松脂总贮藏量为562.1万t·a^(-1),较2002年增加118.4%;林分单位面积的蓄积量和贮脂量分别为76.1 m^3·hm^(-2)和1 090.5 kg·hm^(-2)a^(-1),较2002年分别增长57.56%和89.1%。其中,近、成、过熟林面积占总量的35.1%,增加13.0%,蓄积占总量的57.0%,增加12.8%;幼、中龄林面积占总量的64.9%,减少13.0%,蓄积占总量的43.0%,减少12.8%。主要用于采脂的用材林和薪炭林面积为889.7万hm^2,占总量的59.3%,增长4.8%,数量较2002年减少38.2%;单位面积蓄积为67.6 m^3·hm^(-2),较2002年增加52.2%;松脂贮藏量为404.7万t·a^(-1),占总量的72.0%,下降8.9%,数量较2002年增长150.3%。【结论】我国采脂松树资源林分质量有所提高,松脂资源总量增长,单位面积贮脂量增加,后续采脂资源中幼龄林减少较多,本土传统优势的采脂松树马尾松数量剧减。可采脂松树资源中近、成、过熟林比例大幅增加,面积由原占22.1%增至占35.1%,蓄积由原占44.2%增至占57.0%,幼、中龄林大幅减少。全国17个省(市)区均有规模采脂松树资源分布,云南的资源量和贮脂量最多,各地的数量前后期相比较发生了较大变化,松脂资源由过去主要在沿海分布转向西南内陆地区的趋势明显。 展开更多
关键词 资源 动态变化 松树 贮脂量
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中国各省(市)区松脂资源的动态变化及评价 被引量:2
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作者 文明 董静曦 +3 位作者 李伟平 张伏全 洪焰泉 丁辉 《西部林业科学》 CAS 2016年第2期15-21,共7页
应用2002年和2012年全国森林资源连续清查数据,对中国各省(市)区的采脂松树资源和松脂贮量进行计算估测分析。结果表明,规模采脂松树树种在江西、安徽、四川、湖北、湖南、广东等6省增加了湿地松,江西、广西、湖南、福建、广东、浙江、... 应用2002年和2012年全国森林资源连续清查数据,对中国各省(市)区的采脂松树资源和松脂贮量进行计算估测分析。结果表明,规模采脂松树树种在江西、安徽、四川、湖北、湖南、广东等6省增加了湿地松,江西、广西、湖南、福建、广东、浙江、湖北、安徽、四川、贵州、河南、江苏等地原有的马尾松面积剧减了50%以上。现有16个省(市)区具有采脂松树资源分布,各地的采脂松树和贮脂数量与前期相比较发生了较大变化,采脂松树的面积和松脂贮量云南省均为最多。除西藏、江苏采脂林分的单位面积的蓄积量减少外,其他14个省(市)区采脂林分的单位蓄积量大幅增加,林分质量显著提高。各省(市)区中幼龄林所占的比例大幅减小,近成过熟林比例增高,采脂后续资源贮备不足。总体而言,各省(市)区采脂松林面积减少,但林分质量提高,松脂贮量增加,松脂资源分布由过去主要在沿海向西南内陆地区转移的趋势明显。 展开更多
关键词 全国森林资源连续清查 资源 林分质 面积 贮脂量
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Effect of Cooking Method and Storage on the Quality of Minced Pork
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作者 H.S. Lin J.Y. Lee B.C. Ke 《Journal of Agricultural Science and Technology(A)》 2011年第8期1249-1256,共8页
Minced pork paste was mixed with cooked rice and noodle resulted in very popular traditional gourmet meal in Taiwan. The 100 ℃, 4 h was normally cooking condition for commercial business. However, the pressure cooker... Minced pork paste was mixed with cooked rice and noodle resulted in very popular traditional gourmet meal in Taiwan. The 100 ℃, 4 h was normally cooking condition for commercial business. However, the pressure cooker with higher cooking temperature (106 ℃, 116 ℃ and 121 ℃) and different cooking time were under studied in order to improving efficiency, quality and even cost down. The samples of neck pork substitute, cooking at 106℃, 100 rain; 116℃, 75 min; 121 ℃, 45 min with different pressure were perfomed the result as well as traditional 20% fat in ordinary formulation and cooking at 100℃ for 4 h. During storage, the products were taste acceptable for 4 weeks at 4 ℃, 4 months at - 18 ℃ and better than 1 day at 25 ℃ storage. 展开更多
关键词 Minced pork paste sensory trait AV (Acid value) POV (peroxide value)
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The effect of fasting and body reserves on cola tolerance in 2 pit-building insect predators
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作者 Inon SCHARF Alma DANIEL +1 位作者 Heath Andrew MACMILLAN Noa KATZ 《Current Zoology》 SCIE CAS CSCD 2017年第3期287-294,共8页
Pit-building antlions and wormlions are 2 distantly-related insect species, whose larvae construct pits in loose soil to trap small arthropod prey. This convergent evolution of natural histories has led to additional ... Pit-building antlions and wormlions are 2 distantly-related insect species, whose larvae construct pits in loose soil to trap small arthropod prey. This convergent evolution of natural histories has led to additional similarities in their natural history and ecology, and thus, these 2 species encounter similar abiotic stress (such as periodic starvation) in their natural habitat. Here, we measured the cold tolerance of the 2 species and examined whether recent feeding or food deprivation, as well as body composition (body mass and lipid content) and condition (quantified as mass-to-size residuals) affect their cold tolerance. In contrast to other insects, in which food deprivation either enhanced or impaired cold tolerance, prolonged fasting had no effect on the cold tolerance of either species, which had similar cold tolerance. The 2 species differed, however, in how cold tolerance related to body mass and lipid content: although body mass was positively correlated with the wormlion cold tolerance, lipid content was a more reliable predictor of cold tolerance in the antlions. Cold tolerance also underwent greater change with ontogeny in wormlions than in antlions. We discuss possible reasons for this lack of effect of food deprivation on both species' cold tolerance, such as their high starvation tolerance (being sit-and-wait predators). 展开更多
关键词 chill coma DEPRIVATION ECOPHYSIOLOGY fat content food HUNGER MORPHOMETRICS Myrmeleontidae Vermileonidae.
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