This study aimed to provide theoretical basis for an optimized land use of Xigu District in Lanzhou City,Gansu Province.With the support of GIS platform,structural characteristics of 11 land use types in Xigu District...This study aimed to provide theoretical basis for an optimized land use of Xigu District in Lanzhou City,Gansu Province.With the support of GIS platform,structural characteristics of 11 land use types in Xigu District were analyzed by utilizing fragmentation degree,shape index,fractal dimension,diversity and such landscape pattern indices.展开更多
In order to preserve Wuyi Mountain effectively and analyze the relationship between human activity and landscape structure,the Wuyishan Scenery District,which was disturbed stronger than the other 3 parts of Wuyi Moun...In order to preserve Wuyi Mountain effectively and analyze the relationship between human activity and landscape structure,the Wuyishan Scenery District,which was disturbed stronger than the other 3 parts of Wuyi Mountain,was chosen for the study,and its spatial pattern was studied by landscape indices at two scale levels of landscape element and the whole landscape.The results showed as follows:①Pinus massoniana forest was the matrix landscape in Wuyishan Scenery District,its dominance was very obvious(60.01% of area).Farmland(12.89%) and Camellia sinensis plantation(11.68%) was the second and the third respectively;②From the results of mean patch shape index(MSI i),mean proximate circular index(MPCI i) and mean patch stretch index(MPSI i),showed that Pinus massoniana forest,farmland and Camellia sinensis plantation were three most complicated in patch shape,while residential area was the simplest;③The calculation results of mean patch area(MPA i),patch density(PD i) and fragmentation index(FN i)indicated that the degree of fragmentation of residential area was highest,that of Camellia sinensis plantation and economic forest ranked the second and the third respectively,while that of Pinus massoniana forest was lowest.In addition,the separation index(SI i)also revealed that the separation degree of residential area was highest,while that of Pinus massoniana forest was lowest.These results proved powerfully that human activity was one of the main factors breaking the landscape into fragments;④At the whole landscape level,the values of biodiversity(H),dominance(D),evenness (H′) and degree of fragmentation(FN) of the Wuyishan Scenery District were 0.573 1,0.426 9,0.405 7 and 0.005 6 respectively.After comparisons between the Wuyishan Scenery District and other areas(including forest landscape,agriculture landscape,urban landscape,wetland landscape and desert oases landscape)were further analyzed,it was concuded that the Wuyishan Scenery District is one of the areas which have been well preserved up to now.展开更多
The condition of soil structure is an important factor to affect soil fertility.The soil heterogeneity,which embodies the landscape heterogeneity,has an important role in revealing the form mechanism,function and vari...The condition of soil structure is an important factor to affect soil fertility.The soil heterogeneity,which embodies the landscape heterogeneity,has an important role in revealing the form mechanism,function and variation of landscape.In this paper,the soil physical property heterogeneities of six types of forest landscape in Wuyishan scenery district include Pinus massoniana forest, Cunninghamia lanceolata forest,economic forest,bamboo forest,broad leaved forest and Camellia sinensis plantation were analyzed,and the fractal model was used to study the soil aggregate structure.The results showed that the soil physical property heterogeneities of different forest landscapes were distinct.The stand structure of three natural forests( Pinus massoniana forest, Cunninghamia lanceolata forest and broad leaved forest)were more complex than that of three artificial forests(economic forest,bamboo forest and Camellia sinensis plantation),thus,their fractal dimensions of soil aggregate were lower,the contents of the particle > 0.25 mm aggregate and > 5 mm aggregate were higher,the capacity of stable aggregate composition under water and permeability of soil were more splendid,the performance of self-regulation and resistance were better,and the non-capillary pore of soil were more flourishing than artificial forests. The regression models for fractal dimension (D)of aggregated structure and water stable aggregate(>0.25 mm and >5 mm)content,and for D and destroyed structure percentage were further established,and the results indicated the their regression relationships of all the models were remarkable,therefore,the fractal dimension of soil structure could be used as an index in characterizing the soil fertility.展开更多
文摘This study aimed to provide theoretical basis for an optimized land use of Xigu District in Lanzhou City,Gansu Province.With the support of GIS platform,structural characteristics of 11 land use types in Xigu District were analyzed by utilizing fragmentation degree,shape index,fractal dimension,diversity and such landscape pattern indices.
文摘In order to preserve Wuyi Mountain effectively and analyze the relationship between human activity and landscape structure,the Wuyishan Scenery District,which was disturbed stronger than the other 3 parts of Wuyi Mountain,was chosen for the study,and its spatial pattern was studied by landscape indices at two scale levels of landscape element and the whole landscape.The results showed as follows:①Pinus massoniana forest was the matrix landscape in Wuyishan Scenery District,its dominance was very obvious(60.01% of area).Farmland(12.89%) and Camellia sinensis plantation(11.68%) was the second and the third respectively;②From the results of mean patch shape index(MSI i),mean proximate circular index(MPCI i) and mean patch stretch index(MPSI i),showed that Pinus massoniana forest,farmland and Camellia sinensis plantation were three most complicated in patch shape,while residential area was the simplest;③The calculation results of mean patch area(MPA i),patch density(PD i) and fragmentation index(FN i)indicated that the degree of fragmentation of residential area was highest,that of Camellia sinensis plantation and economic forest ranked the second and the third respectively,while that of Pinus massoniana forest was lowest.In addition,the separation index(SI i)also revealed that the separation degree of residential area was highest,while that of Pinus massoniana forest was lowest.These results proved powerfully that human activity was one of the main factors breaking the landscape into fragments;④At the whole landscape level,the values of biodiversity(H),dominance(D),evenness (H′) and degree of fragmentation(FN) of the Wuyishan Scenery District were 0.573 1,0.426 9,0.405 7 and 0.005 6 respectively.After comparisons between the Wuyishan Scenery District and other areas(including forest landscape,agriculture landscape,urban landscape,wetland landscape and desert oases landscape)were further analyzed,it was concuded that the Wuyishan Scenery District is one of the areas which have been well preserved up to now.
文摘The condition of soil structure is an important factor to affect soil fertility.The soil heterogeneity,which embodies the landscape heterogeneity,has an important role in revealing the form mechanism,function and variation of landscape.In this paper,the soil physical property heterogeneities of six types of forest landscape in Wuyishan scenery district include Pinus massoniana forest, Cunninghamia lanceolata forest,economic forest,bamboo forest,broad leaved forest and Camellia sinensis plantation were analyzed,and the fractal model was used to study the soil aggregate structure.The results showed that the soil physical property heterogeneities of different forest landscapes were distinct.The stand structure of three natural forests( Pinus massoniana forest, Cunninghamia lanceolata forest and broad leaved forest)were more complex than that of three artificial forests(economic forest,bamboo forest and Camellia sinensis plantation),thus,their fractal dimensions of soil aggregate were lower,the contents of the particle > 0.25 mm aggregate and > 5 mm aggregate were higher,the capacity of stable aggregate composition under water and permeability of soil were more splendid,the performance of self-regulation and resistance were better,and the non-capillary pore of soil were more flourishing than artificial forests. The regression models for fractal dimension (D)of aggregated structure and water stable aggregate(>0.25 mm and >5 mm)content,and for D and destroyed structure percentage were further established,and the results indicated the their regression relationships of all the models were remarkable,therefore,the fractal dimension of soil structure could be used as an index in characterizing the soil fertility.
