RESUMO
Soil heterogeneity is at a high level in the karst areas, which resulted from the complex habitat. On the one hand, plants have some adaptive strategies to such special habitats by forming certain morphological and physiological characteristics, which result in higher diversity of functional traits. One the other hand, plants improve the physical and chemical properties of soil through a series of life activities. The interactions between plants and soil drive ecosystem structure and function and its responses to global climate change. Here, we summarized the characteristics of soil hete-rogeneity in the karst areas, and reviewed the response of plant functional traits to soil and the feedback of plants to soil. It revealed the coupling mechanism between plants and soil in karst eco-system. We provided a future outlook, including future research contents and directions based on the current research status in this field, which aimed to provide theoretical reference for maintaining the structural and functional stability of fragile karst ecosystems.
Assuntos
Ecossistema , Solo , Plantas , Microbiologia do SoloRESUMO
Based on the small scale characteristics of the basin, which is a kind of special landform influenced by the human activities obviously in Karst mountain area, the system grid method and the semivariogram model were used to analyze the 15 basins which belonged to three types in the territory of Guizhou Province to reveal the general pattern of spatial evolution of land use intensity and the mutual relationship with the landscape pattern change of the typical basins in the Karst mountainous area of Guizhou Province in 2005, 2010 and 2015. The results showed that the dynamic spatial evolution of land use intensity and response mode of landscape pattern showed obvious difference under the different basin types. In general, with the decrease of economic level of the basins from high to low, the land use intensity decreased in the form of a gradient. At the level of microcosmic evolution, the land use intensity of basins in the center of the cities and counties descended first and then ascended in the form of concentric band around the periphery of the center in the basin, and the spatial evolution trend of this kind of basin exhibited a stable and expanded form. The land use intensity of basins surrounding cities and towns, with a high intensity center, that could either increase or decrease, exhibited a fluctuating spatial evolution trend. The land use intensity of remote basins was basically stable, even slightly weakened and its space evolution was stable and debilitating. Because of the divergence of dominant function of the basins, there were five different modes of response between the change of land use intensity and landscape pattern of basins. During the study period, the spatial evolution of land use intensity of these 3 basin types was driven by natural and human factors. The interaction among various factors formed the typical characteristics of the land use intensity spatial evolution type of different basins.
Assuntos
Conservação dos Recursos Naturais , Ecossistema , China , Cidades , Atividades Humanas , HumanosRESUMO
<p><b>OBJECTIVE</b>To observe the clinical efficacy of electroacupuncture (EA) on mild cognitive impairment (MCI) for patients of Uygur and Han nationality and explore the national diversity among the patients with MCI.</p><p><b>METHODS</b>Twenty-five cases were divided into Han nationality group (15 cases) and Uygur nationality group (10 cases) according to patient's nationality. In either group, EA was applied to Baihui (GV 20), Fengchi (GB 20), Xuanzhong (GB 39), Fuliu (KI 7), Sanyinjiao (SP 6) and Taixi (KI 3), once per day, 15 treatments made one session and there were 5 days at the interval among the sessions. Totally, 3 sessions of treatment were required. The proton magnetic resonance spectroscopy (1H-MRS) was used to observe the changes in the ratio of N-acetylaspartate and creatine (NAA/Cr) on the left hippocampus for the patients in two groups before and after treatment as well as the changes in the results of the Mini-Mental State Examination (MMSE) and the Montreal Cognitive Assessment (MoCA) separately.</p><p><b>RESULTS</b>NAA/Cr in Uygur nationality group was higher than that in Han nationality group before treatment (1.659 +/- 0.418 vs 1.137 +/- 0.190, P < 0.05). After treatment, MMSE and MoCA scores all increased apparently as compared with those before treatment in two groups (P < 0.05, P < 0.01), and NAA/Cr on the left hippocampus in either group was up-regulated as compared with that before treatment (both P < 0.01).</p><p><b>CONCLUSION</b>EA can improve the overall cognitive function for the patients with MCI. There is the national diversity in the partial brain metabolite level between Uygur patients and Han patients with MCI.</p>
