浙江山区珍稀濒危植物的分布特征与保护     

刘鹏  陈立人 《山地学报》1996,(4)

浙江山区的珍稀濒危植物较为丰富，有６７科、１０８属、１２５种．论述了当地珍稀濒危植物的特点、地理分布、属和种的地理成分，探讨了珍稀濒危植物的就地保护、迁地保护和离体保存．  相似文献   

浙江北山植物资源及其开发利用     

刘鹏  郭水良  蔡在龙 《山地学报》1992,(3)

北山位于浙江中部,地处中亚热带北缘,计有野生维管植物167科,574属,1149种。本文评价了北山植物资源的现状,提供了合理开发利用的途径,提出了今后开发利用的重点,并对植物资源的保护提出了一系列的建议。  相似文献   

煤古植物学:历史、现状与展望   总被引：2，自引：0，他引：2  

张泓  沈光隆 《地球科学进展》1995,10(2):159-163

据对５０年来的文献分析，简要评述了煤古植物学这一分支学科的产生背景，研究现状和未来发展趋势；并指出，煤古植物学尽管有广泛的应用前景，但由于受研究方法和研究手段的限制，它仍处于发展的初级阶段。  相似文献   

辽宁核电站温坨子厂址东岗断裂活动性研究     

钟以章  张正曙 《中国地震》1993,9(4):364-372

本文在综合地质、地貌、地形变、地震、物探和年代测定等资料的基础上，对东岗断裂的活动性进行了全面分析。所得结果表明，东岗断裂性在中更新世时期有过两期活动，但自晚更新世（１０万年）以来没有活动，故可鉴定为非能动性断裂。  相似文献   

横断山区植物区系的基本特点     

李鼎甲 《山地学报》1988,(3)

横断山区植物区系的基本特点为,植物种类多,古老植物多,特有植物多,地理成分复杂,各地理成分联系复杂,植物分化强烈。  相似文献   

Comparability of Biogenic VOC Emission Rate Measurements under Laboratory and Ambient Conditions at the Example of Monoterpene Emissions from Scots Pine (Pinus sylvestris)     

M. Komenda  K. Kobel  R. Koppmann  J. Wildt 《Journal of Atmospheric Chemistry》2003,45(1):1-23

Laboratory experiments under controlled environmental conditions are a useful tool to investigate the influence of different environmental parameters on VOC emissions from plants individually. Before using the obtained results to interpret measurements under ambient conditions, it has to be ensured that the laboratory system is suitable for performing emission rate measurements under ambient-like conditions to derive algorithms describing the emissions of volatile organic compounds as a function of physical variables like temperature and light intensity. Here we compare results from monoterpene emission rate measurements with Scots pines (Pinus sylvestris L.) under both ambient environmental conditions using a mobile plant enclosure chamber, and under controlled laboratory conditions in a continuously stirred tank reactor. The different analytical instruments to quantify monoterpene emissions were compared in an intercalibration experiment. Measurements of the mixing ratios of -pinene, -pinene, 3-carene, camphene, and limonene on the order of some hundred parts per trillion differed by less than 20%. The laboratory system has proven capable of providing ambient-like conditions and results of monoterpene emission rate measurements under laboratory conditions could be extrapolated to the natural environment. Monoterpene emission rate measurements with identical specimens of Scots pines conducted within small temporal differences under similar laboratory and outdoor conditions agreed well. Both laboratory and outdoor experiments clearly showed that distinct and constant values neither exist for the standard emission rates nor for the emission pattern of monoterpenes from Scots pine. Temporal variations in the standard emission rates from identical specimens and plant-to-plant variations were on the order of one magnitude.  相似文献   

Spatial and temporal trend of sewage pollution indicated by coprostanol in Macao Estuary,southern China   总被引：1，自引：0，他引：1  

Peng X  Zhang G  Mai B  Min Y  Wang Z 《Marine pollution bulletin》2002,45(1-12):295-299

Bottom sediments and a ²¹⁰Pb dated sedimentary core in Macao Estuary were quantitatively analyzed with GC-MS for coprostanol and other sterols. Higher coprostanol concentrations were detected at Port Interior and Lower Qianshan River, indicative of serious sewage pollution from densely populated Macao Island and Zhuhai City. However, very low concentrations of coprostanol were detected around Coloane Island as well as Port Exterior and Maliuzhou River except sites adjacent sewage outlets. Coprostanol pollution in Macao Estuary originates mainly from locally direct discharge of untreated wastewater. The concentrations of coprostanol in ZJ-9 were mainly in range of 150–280 ng/g with an average of 210 ng/g for more than 20 years from early 1970s to early 1990s. However, it increased obviously since 1993, and reached the highest in 1995–1996. However, a sharp decrease of coprostanol concentration from 470 to 31 ng/g after 1996 was observed corresponding to the first wastewater treatment plant in Taipa Island going into action.  相似文献   

阜康典型荒漠C3植物稳定碳同位素值的环境分析   总被引：26，自引：3，他引：23  

陈拓  马健  冯虎元  何元庆  徐世健  强维亚  安黎哲 《干旱区地理》2002,25(4):342-345

通过对阜康典型荒漠C3植物稳定碳同位素值的分析。叶片炭同位素值在-23‰和-29‰之间变化,其中主要在-27‰附近波动。这与前人报道的世界上其他地区荒漠植物碳同位素值的变化非常一致。降水可以改变叶片碳同位素值的大小,降水越多,叶片碳同位素值越负,它们的变化幅度有物种的依赖性。叶片碳同位素值也受植物生长形式或期望寿命的影响,木本植物或寿命长的植物叶片碳同位素值要高。分析表明,利用该区土壤或陆相沉积中有机质碳同位素值可以判断气候的干湿变化：土壤或陆相沉积中有机质碳同位素值越高,气候则越干燥。  相似文献   

佛坪自然保护区植物群落物种多样性与海拔梯度的关系   总被引：35，自引：4，他引：31  

岳明  张林静  党高弟  辜天琪 《地理科学》2002,22(3):349-354

用多元统计分析方法研究了佛坪自然保护区植物群落多种性及群落各生长型多样性特征沿海拔梯度的变化。结果表明：1）植物群落的Shannon指数与Simpson指数及物种丰富度与海拔梯度均呈显著负相关关系;2）乔木层的物种多样性沿海拔梯度的变化则体现了“中国高度膨胀”的规律,即中等海拔高度上多样性高而低海拔和高海拔多样性较低;3）灌木层丰富度指数在1600-1700m之间有个很不明显的峰值,而其它4个指标沿海拔呈单调的下降趋势;4）草本层植物多样性呈先降后升的趋势,在中等海拔高度较低。  相似文献   

中东亚干旱半干旱区C₃植物δ¹³ C值的分布 及其对气候的响应^*          下载免费PDF全文

王丽霞  李心清  郭兰兰 《第四纪研究》2006,26(6):955-961

植物化石和土壤中的有机质碳同位素指标常用来反映古气候的变化,然而碳同位素这个指标在特定地区反映气候的定量关系缺乏检验。研究剖面选择自中国的秦岭(34°14'24″N,106°55'30″E)到蒙古人民共和国北部,接近贝加尔湖地区(51°35'08″N, 100°45'49″E)的研究剖面线,选择了3种C₃植物(Artemisia scoparia, Ajania achilleides 和 Artemisia frigida),在剖面线上沿南北方向上每隔4'到5'采取一个样点,共选取161个C₃植物茎叶样品进行了δ¹³ C值测定。同时收集了剖面线附近气象站的降水、气温等资料,用插值方法得到每个采样点的气温、降水数据。分析表明:C₃植物的δ¹³ C值分布范围为-30 ‰ ~-22 ‰ ,其平均值为-26.81 ‰ ,该平均值较全球C₃植物δ¹³ C平均值偏正。通过对比C₃植物δ¹³ C与年均温、年均降水量、生长季节的干燥度等随纬度的变化规律,发现C₃植物δ¹³ C、年均降水量、生长季节的干燥度有非常一致的变化趋势,而C₃植物δ¹³ C和年均温不具有一致性。通过一元回归分析也同样发现C₃植物δ¹³ C与年均降水量呈线性负相关关系(y=-0.0077x-24.838,n=161,R²=0.4418,p=0.01),与生长季节的干燥度呈线性正相关关系(y=0.7328x-28.806,n=161,R²=0.3685,p=0.01),而与年均温度没有明显的相关关系(y=-0.0461x-26.756,n=161,R²=0.0232,p=0.01)。在本研究区C₃植物δ¹³ C对年均降水量和生长季节的干燥度响应十分显著,而对温度的响应不明显。研究区具有明显的降水和温度的梯度分布特征,是验证植物碳同位素与气候关系的理想场所,而土壤中的有机质碳同位素与其地面上的植物碳同位素息息相关。研究也说明,在本研究区或其他气候植物组合相似的地区可以利用古土壤中的有机质碳同位素来定量或半定量地反映古气候的变化。  相似文献