These results indicate that the three studied clonal herbs demonstrated division of labor induced by reciprocal patchiness of light and nutrients 這表明,三種克隆植物發(fā)生了環(huán)境誘導(dǎo)的克隆內(nèi)分工行為。
The annual variation of runoff turned to uniform with the landscape patchiness index and landscape diversity index increased , and it turned to extreme with the landscape contagion index and landscape dominant index increased , and it did not relate to landscape shape index 隨著景觀破碎度和景觀多樣性的增大,流域徑流年內(nèi)分配趨于均衡;而隨景觀聚集度的增大,流域徑流年內(nèi)分配則趨向集中,景觀形狀對(duì)流域徑流調(diào)節(jié)作用不明顯。
It is concluded that clonal plasticity is an alternative means for clonal plants to battle environmental heterogeneity . in another greenhouse experiment , we addressed the responses of three stoloniferous clonal herbs inhabiting different habitats to artificial environments with reciprocal patchiness of light and nutrients 在另一溫室實(shí)驗(yàn)中,研究了三種匍匐莖克隆草本鵝絨委陵菜、金戴戴和絹毛匍匐委陵菜對(duì)光照和養(yǎng)分資源交互斑塊性環(huán)境的反應(yīng)。
Anthropogenic activities ( e . g . development , over - grazing , timber harvest ) can disrupt the structural integrity of oasis - desert landscapes and is expected to impede diversity communities across the landscape and make it fragmented . with human dimension and activities enhancing , the patchiness grain , edge density and landscape contrast become large , landscape diversity and patch fractal dimension decreased 隨著人類活動(dòng)的增強(qiáng),斑塊粒度、邊緣密度、分散度、對(duì)比度變大,而景觀多樣性下降,斑塊分維數(shù)變小,人類生產(chǎn)經(jīng)營活動(dòng)導(dǎo)致了綠洲-荒漠景觀破碎化,綠洲和荒漠生態(tài)系統(tǒng)界面上的突變性、對(duì)比度和異質(zhì)性增強(qiáng)。
The death rate of individuals in dongwenquan population shows another pattern with slowly raise along with the age . 3 with the use of the dispersal index ( di ) clump intensity ( ci ' s ) mean crowding ( m * ) patchiness index ( pai ) . . green ' s index ( gi ) and intensity index as parameters , we further studied the spatial distribution patterns of the three populations , chtoran , hoidesyaog )種群結(jié)構(gòu)與動(dòng)態(tài)研究3 、用leshe矩陣模型定量預(yù)測(cè)三個(gè)種群未來20a的數(shù)量與年齡結(jié)構(gòu)變化的結(jié)果顯示,北溫泉緒云衛(wèi)矛種群數(shù)量在未來4a內(nèi)會(huì)有一定程度的減少,以后的種群數(shù)量逐漸增加,呈不斷擴(kuò)大的趨勢(shì),而這其中幼齡個(gè)體所占的比例越來越大,老齡個(gè)體的比例越來越小。
The landscape diversity index , dominance index , patch average area and patchiness have changed respectively from 1 . 72 to 1 . 886 , 0 . 139 to 0 . 359 , 3 . 220 to 3 . 103 and from 27 . 361 to 26 . 878 in different time from 1986 to 2000 , which shows that the degree of landscape fragmentation has increased . such increase reflects severe interference of humankind . the result also shows that the spatial pattern of urban landscape has many problems such as unreasonable distribution , single configuration , reduced connectedness , increased fragmentation , decreased types of natural landscape and increased loss of soil and water 將1986年的指數(shù)與2000年的指數(shù)進(jìn)行比較發(fā)現(xiàn),景觀的多樣性指數(shù)和優(yōu)勢(shì)度指數(shù)都增加了,分別由1 . 72增加到1 . 886和由0 . 193增加到0 . 359 ;而平均斑塊面積和景觀鑲嵌度指數(shù)都減小了,分別由3 . 22減到3 . 103和27 . 361減為26 . 878 。
We studied its distribution pattem by using the following measures f the test for fitting to the poisson , negative binomial and neyman a distribution . at the same time , we use negative binomial parametef , dispersal index , patchiness index , cassie s index and clumping index , estimated the aggregation intensity . the results showed that the distribution pattern is typically aggregated , and the intensity of aggregation vari 經(jīng)統(tǒng)計(jì)分析,青島百合復(fù)合種群、各局部種群內(nèi)個(gè)體的分布格局離散分布擬合的結(jié)果符合負(fù)二項(xiàng)分布;各聚集強(qiáng)度參數(shù)中,叢生指標(biāo))和cassie指標(biāo)(二k )均大于o ,負(fù)h項(xiàng)參數(shù)限)均較小,擴(kuò)散系數(shù)k卜擴(kuò)散型指數(shù))和聚塊性指標(biāo)( m m )均大于1 ,以上這些表明各個(gè)局部種群的分布格局都為聚集分布。