共查询到20条相似文献,搜索用时 15 毫秒
1.
南方铁杉种群结构动态与空间分布格局 总被引:2,自引:2,他引:2
采用"空间序列代替时间变化"的方法,对武夷山南方铁杉种群进行分析。结果表明样地1、样地2与样地4中的南方铁杉种群均处于小树及中树时期,而生长在样地3和样地5中的南方铁杉种群的幼树与老树分别占据主导地位。运用C、K、M*/x-、I和Ca5种指标测定种群空间分布格局和动态,结果一致表明5块样地中南方铁杉种群均呈现出聚集分布,但不同样地南方铁杉聚集分布的成因有所不同。通过分析南方铁杉种群存活曲线、死亡曲线和死亡率曲线,结果表明南方铁杉有一个死亡最低峰,存活曲线趋于DeeveyⅡ型。 相似文献
2.
3.
Packer C Hilborn R Mosser A Kissui B Borner M Hopcraft G Wilmshurst J Mduma S Sinclair AR 《Science (New York, N.Y.)》2005,307(5708):390-393
Territorial behavior is expected to buffer populations against short-term environmental perturbations, but we have found that group living in African lions causes a complex response to long-term ecological change. Despite numerous gradual changes in prey availability and vegetative cover, regional populations of Serengeti lions remained stable for 10- to 20-year periods and only shifted to new equilibria in sudden leaps. Although gradually improving environmental conditions provided sufficient resources to permit the subdivision of preexisting territories, regional lion populations did not expand until short-term conditions supplied enough prey to generate large cohorts of surviving young. The results of a simulation model show that the observed pattern of "saltatory equilibria" results from the lions' grouping behavior. 相似文献
4.
5.
[目的]明确烟草田间蛴螬类害虫的种类组成及种群空间分布特点,为蛴螬类害虫的预测预报及田间防控提供理论指导.[方法]于2015—2019年,以云南省大理州弥渡县红花大金元烟田为调查点,采用五点取样法对烟田中的蛴螬种类组成进行系统调查;利用Iwao回归法和Taylor幂函数法计算测定蛴螬混合种群的空间分布特征,并利用种群聚集均数分析蛴螬类害虫在田间的聚集原因;根据空间分布格局,模拟形成烟田蛴螬混合种群的抽样技术.[结果]云南省大理州弥渡县红花大金元烟田共发现5种蛴螬,隶属于3科5属,其中小黄鳃金龟(Metabolus flavescens Brenske)和铜绿丽金龟(Anomala corpulenta Motschulsky)是优势种,相对多度分别为33.09%和34.96%.蛴螬混合种群在红花大金元烟田中主要以个体群呈聚集分布,且聚集程度与密度呈正相关,但个体间相互排斥.聚集均数(λ)分析结果显示λ值均小于2,表明蛴螬在田间的聚集原因主要是由气候、土壤湿度和植株生长状况等环境因素引起.根据Iwao的m*-m回归方程,建立了不同精度下蛴螬类害虫的理论抽样数和序贯抽样模型,当蛴螬防治标准为2头/株时,蛴螬田间的累积虫量高于上限指标(T1)即应采取防治措施.[结论]云南省大理州弥渡县烟区红花大金元烟田共有5种蛴螬混合发生,混合种群主要以个体群在田间呈聚集分布,聚集度依赖于密度,聚集原因主要由环境因素引起. 相似文献
6.
密度与氮素水平对小黑麦群体动态、产量及构成因素的影响 总被引:2,自引:1,他引:2
以小黑麦东农5305为材料,设置氮水平和栽培密度两个因子,施氮量0、75、150、225kg·hm-2;密度300、450、600万株·hm-2,研究了不同密度与氮素水平对小黑麦分蘖成穗及产量构成的影响。结果表明,东农5305在300万株·hm-2、75kg·hm-2处理时茎蘖成穗率最高,产量也最高。由此可知,对于分蘖能力较高的东农5305应适当降低基本苗,少施氮肥,主攻穗粒数和千粒重,实现高产。 相似文献
7.
沙棘木蠹蛾危害特性与种群数量的时空动态研究 总被引:6,自引:6,他引:6
作者于2003年5月至11月对沙棘木蠹蛾卵和幼虫的危害特性和种群数量的时空动态进行了研究.结果表明:沙棘木蠹蛾主要产卵在干部树皮裂缝、伤口等处,卵孵化后,初孵幼虫首先取食树干的韧皮部,然后逐渐向下转移危害根部.根部幼虫主要取食木质部,形成多条纵向的蛀道,通过蛀道在主根与侧根、侧根与侧根间进行转移危害.树干上的卵和初孵幼虫多集中在2 m以下,而根部的幼虫主要聚集在距离地面20 cm以内的主根上.从5月至11月,非当年生幼虫基本呈现递减的变化趋势,6月和10月减少的幅度较大.当年生幼虫则从7月逐渐增加至9月达到最大,而后又急剧减少.从8月到11月,幼虫的聚集位置和种群数量都呈现向树下部转移的趋势,10月初转移至根部的幼虫达70.5%,树干上分布的仅有29.5%,且大部分都集中在树干1.2 m以下的位置.11月初,幼虫已基本转移至地下根部,此时树干上幼虫分布很少. 相似文献
8.
《农业科学学报》2017,(10)
The objective of this work was to develop a dynamic model for describing leaf curves and a detailed spatial geometry model of the rice leaf(including sub-models for unexpanded leaf blades,expanded leaf blades,and leaf sheaths),and to realize threedimensional(3 D) dynamic visualization of rice leaves by combining relevant models. Based on the experimental data of different cultivars and nitrogen(N) rates,the time-course spatial data of leaf curves on the main stem were collected during the rice development stage,then a dynamic model of the rice leaf curve was developed using quantitative modeling technology. Further,a detailed 3 D geometric model of rice leaves was built based on the spatial geometry technique and the non-uniform rational B-spline(NURBS) method. Validating the rice leaf curve model with independent field experiment data showed that the average distances between observed and predicted curves were less than 0.89 and 1.20 cm at the tilling and jointing stages,respectively. The proposed leaf curve model and leaf spatial geometry model together with the relevant previous models were used to simulate the spatial morphology and the color dynamics of a single leaf and of leaves on the rice plant after different growing days by 3 D visualization technology. The validation of the leaf curve model and the results of leaf 3 D visualization indicated that our leaf curve model and leaf spatial geometry model could efficiently predict the dynamics of rice leaf spatial morphology during leaf development stages. These results provide a technical support for related research on virtual rice. 相似文献
9.
Coulson T MacNulty DR Stahler DR vonHoldt B Wayne RK Smith DW 《Science (New York, N.Y.)》2011,334(6060):1275-1278
Environmental change has been observed to generate simultaneous responses in population dynamics, life history, gene frequencies, and morphology in a number of species. But how common are such eco-evolutionary responses to environmental change likely to be? Are they inevitable, or do they require a specific type of change? Can we accurately predict eco-evolutionary responses? We address these questions using theory and data from the study of Yellowstone wolves. We show that environmental change is expected to generate eco-evolutionary change, that changes in the average environment will affect wolves to a greater extent than changes in how variable it is, and that accurate prediction of the consequences of environmental change will probably prove elusive. 相似文献
10.
巴山冷杉种群结构及空间分布格局的研究 总被引:11,自引:0,他引:11
在太白山自然保护区设置 2 0 m× 2 0 m样地 8块 ,应用相邻格子法进行每木调查 ,并对巴山冷杉(Abies fargesii)种群结构和分布格局进行了动态分析。结果表明 ,种群大小结构为进展型 ,幼苗、幼树的后备资源储备量大 ,约 95 4株 / hm2 ;种群在 ~ 发育阶段死亡率较高 ,达 82 .3% ,随后死亡率趋于稳定 ;存活曲线属于Pearl 或 Deevey C型 ;种群的空间分布格局总体为聚集分布 ,负二项分布参数 (K) 1.6 0 0 ,扩散型指数 (Iδ) 1.6 2 9,丛生指标 (I) 7.6 77,Cassie指标 (CA) 0 .6 2 5 ,扩散系数 (C) 8.6 77,聚块性指标 (m* / m) 1.6 2 5。离散拟合符合负二项分布模型 ;但随着植株年龄的增长及发育阶段的不同 ,分布格局由初期的聚集分布逐渐扩散为随机分布 ,离散拟合由负二项 (Negative Binomial)分布转变为泊松 (Poisson)分布 相似文献
11.
12.
Victor BC 《Science (New York, N.Y.)》1983,219(4583):419-420
Daily otolith increments were used to determine the daily pattern of settlement of the bluehead wrasse (Thalassoma bifasciatum), a Caribbean coral reef fish. Recruitment occurs in brief and sporadic episodes even though bluehead wrasses spawn every day. Patterns of recruitment do not correspond to patterns of mortality on the reef. The composition of the adult population directly reflects the relative rates of recruitment of juveniles the year before. The population dynamics of this species may therefore be determined by the supply of recruits and not by the supply of space or some other resource on the reef. 相似文献
13.
1982~1985年在浙江省余杭市长乐林场等地,记述了日本松干蚧的捕食性天敌13科31种,其中属于义类、蜘蛛类等7种属为首次报道。瓢虫类和蚂蚁类在各种天敌中所占比例最大,相应为35%~51%和30%~35%。蒙古光瓢虫、刻点艳瓢虫和隐斑瓢虫数量最多。在日本松干蚧密度上升时,瓢虫类数量明显增加,在日本松干蚧密度较低时类和蝽类的数量增加。日本松干蚧和松蚜同时发生时,蚂蚁类、螨类和蝽类的数量增加,瓢虫类 相似文献
14.
Xing-fu JIANG 《农业科学学报》2018,17(7):1482-1484
正The oriental armyworm,Mythimna separata(Walker)(Lepidoptera:Noctuidae),is a major migrant pest of grain in China and other Asian countries,causing huge crop production and economic losses nationwide annually.Much of the uniquely difficult aspects of managing M.separata arises from its long-distance migratory behavior.For example,direction and timing of winds from its overwintering regions in the south largely determine where and when large influxes of migrants arrive in the north to oviposit,making prediction of infestations difficult.Since the 1960s,the migration routes and infestation patterns of M.separata in China have been 相似文献
15.
为了解刨花润楠在自然分布状态下的种群结构及其分布特性,为其野生资源保护和人工造林提供理论参考,在广西大明山自然保护区设置3.2 hm2固定大样地,通过野外监测调查,运用林木径级结构代表年龄结构法,对大明山山地常绿阔叶林中刨花润楠的种群结构、空间分布格局及其动态等进行分析.结果显示:大明山自然保护区刨花润楠种群的各级分布结构整体上呈“L”型,种群中Ⅰ级幼树和Ⅱ级小树的个体数分别占47.75%和39.45%,92.4%的个体高度在10m以下;种群的Deevey存活曲线接近于Ⅱ型,表明种群在不同生长阶段中表现出相近一致的死亡消失率;种群的总体空间分布格局为聚集分布型,并具有从早期生长阶段的聚集分布逐渐转变成后期生长阶段均匀分布的动态特征.大明山山地常绿阔叶林的刨花润楠种群结构相对完整,属于增长种群,在自然潜在干扰影响中目前仍处于稳定状态. 相似文献
16.
17.
18.
茶园绒茧蜂数量和空间动态及其与茶尺蠖的相关性 总被引:2,自引:1,他引:2
对西湖龙井原产地景观茶园(2005年,5天调查1次)和绍兴市御茶村茶业公司大面积茶园(2004—2005年,每月调查1次)的茶尺蠖绒茧蜂、单白绵绒茧蜂与茶尺蠖数量进行调查研究,发现绒茧蜂对茶尺蠖跟随效应显著,但通常不足以控制茶尺蠖。对龙井原产地景观中10个茶园、皖南宣郎广茶场13个茶园茶丛上、中、下层绒茧蜂的数量分布作进一步的调查,发现两地的绒茧蜂在上、中、下层数量分布的百分率很相近,约为21%,43%,36%。龙井原产地10个茶园、御茶村4个茶园中,绒茧蜂和茶尺蠖皆以中层最多、下层次之、上层最少。即绒茧蜂在空间上的数量分布趋势与其寄主一致。聚集度指标测定结果表明,绒茧蜂在茶园中呈均匀分布,个别茶园中绒茧蜂呈弱的聚集分布,可能是受寄主聚集分布行为的影响。 相似文献
19.
山西省庞泉沟地区华北落叶松种群空间分布格局 总被引:5,自引:1,他引:5
在庞泉沟自然保护区设置30 m×30 m样地10块,应用相邻格子法进行每木调查,并对华北落叶松种群结构和分布格局进行了分析.结果表明,华北落叶松种群年龄结构为稳定型,幼苗、幼树的后备资源储备量大;取样尺度为5 m×5 m时,华北落叶松种群属于随机分布,随着取样尺度的增大,种群为集群分布,取样尺度为25 m×25 m时,聚集强度较大;在低海拔(1 950~2 050 m)及阳坡,集群分布为华北落叶松种群分布的主要特征,聚集强度较大;而在中高海拔(2 050~2 250 m)及阴坡,华北落叶松种群趋向随机分布,聚集强度减弱. 相似文献