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Accueil du site → Doctorat → Chine → 2015 → Effects of Legume Species Introduction on Plant Communities and Soil Propenies on Abandoned Croplands under Different Landscape Positions on the Semi-arid Loess Plateau,China

Lanzhou University (兰州大学) 2015

Effects of Legume Species Introduction on Plant Communities and Soil Propenies on Abandoned Croplands under Different Landscape Positions on the Semi-arid Loess Plateau,China

袁自强

Titre : Effects of Legume Species Introduction on Plant Communities and Soil Propenies on Abandoned Croplands under Different Landscape Positions on the Semi-arid Loess Plateau,China

Auteur : 袁自强

Grade : Doctoral Dissertation 2015

Université : Lanzhou University (兰州大学)

Résumé partiel
Due to the natural and man-made causes, the semi-arid Loess Plateau has become the most serious soil erosion region in China even in the world. Restoration and revegetation are importation methods to control soil erosion and improve the ecological environment in this region. Legumes forage plays an important role in the sustainable development of the ecosystem on the Loess Plateau, have been widely used in the revegetation process due to their capacities in providing high-quality feed, nitrogen fixation and improving soil quality. Revegetation by converting abandoned croplands to artificial grassland by introducing forage legumes can rapidly increase vegetation and provide high-quality forage. It is not only benefit to the soil erosion controlling but also the livestock development. However, it is still lack of effective evaluates for the dynamics of vegetation and soil in the revegetation process of abandoned croplands after forage legumes introducing. In order to evaluate the long-term effects of revegetation on vegetation and soil properties, we conducted an experiment for 11 years on the semi-arid Loess Plateau by introducing legume forage on abandoned croplands. Our objectives were to evaluate the effects of revegetation on aboveground biomass, vegetation cover, species composition, functional groups and life lifestyles in plant communities, and soil organic carbon, light fraction organic carbon, heavy fraction organic carbon, nitrogen, phosphorus and soil water dynamics in soil on abandoned croplands after forage legumes introducing. Three landscape positions were selected, i.e., Field Ⅰ, north-east facing, upper slope ; Field Ⅱ, south-east facing, middle slope, and Field Ⅲ, south-east facing, top slope. Three treatments were established, i.e., i) cessation of cultivation and natural revegetation, ii) introduction of Medicago sativa L. at a seed density of 22.5 kg-ha-1, and iii) introduction of Melilotus suaveolens L. at a seed density of 11.3 kg-ha-1. Achieved the following results:In the treatment of natural revegetation, aboveground biomass was low in all the fields and had no significantly increase trend with time. The soil water content at the soil layer of 1.4-5 m had a decline trend with time, it was more obvious in Fields Ⅱ and III, and however, it was still higher than the soil permanent wilting point of 4.5% in all fields. Soil organic carbon and total nitrogen contents at the soil layer of 0-20 cm had slight increase trends with time, but total P and available P had no significantly changes with time in all the fields

Mots clés : landscape positions ;revegetation;abandoned croplands ;legume forage ;alfalfa;milk verch ;plant community ;produetivity;soil water ;soil organic carbon ;soil total nitrogen ;the Loess Plateau ;the semi-arid region ;

Présentation (CNKI)

Page publiée le 10 avril 2022