| Fujian Ninghua rare purple soil area, but since ancient times, rather purple soil area of serious soil erosion, desertification severely eroded area, leading to the mountain bare of vegetation growth conditions deteriorate. Soil erosion led to a sharp decline in soil fertility, ecological havoc, seriously affected the daily life of local people, foresters usual tea, chestnut, bayberry and other crops are poor, low income farmers indirectly, losses, grim purple soil erosion area into government a headache and difficult governance issues. In the 1980s, the government introduced Ninghua Masson pine (Pinus massoniana Lamb.) As a pioneer species to improve soil erosion, and achieved some results. However, due to poor fertility of purple soil itself, structural instability, leading to more become old man Masson pine forests, ecological restoration function does not achieve the desired results. This article draws previous management experience, combined with modern purple soil area of soil erosion control on scientific research, according to the actual local conditions Ninghua, choose fruit and grass, tea mode, three planting bushes and trees and grass to be restored as a research model object, delve into their recovery process, physical properties, water stable aggregates, variable carbon content of DOC and MBC change and influence aimed at three planting was obtained by comparing the merits of recovery mode. To provide a theoretical basis Ninghua purple soil recovery, and promote market-oriented, early improvement Ninghua soil erosion, promote local farmers’income to provide a scientific basis. The results showed that:1. Physical properties:three kinds of different vegetation restoration models have good soil for improvement:reduce soil bulk density, soil water content, water holding capacity rises, increasing porosity, water holding capacity of the soil water retention strengthened, soil permeability and permeability improved ability to enhance soil and fertilizer. Comprehensive sort of treatment effect is:fruit grass (Cl) mode> bushes and trees grass (C3) mode> Camellia (C2) mode. Orchard grass vegetation restoration patterns on the best, followed by bushes and trees and grass, and finally the tea mode. Which is the best fruit and grass, governance can not reach more than 85%damage zone.2. Water-stable aggregates:three kinds of different vegetation restoration patterns compared to non-treatment area (CK),> 0.25mm water stable aggregates were significantly improved stability are enhanced. Help to improve the soil to form large aggregates more stable structure and nature, and promote soil structure and water and fertilizer capacity. Comprehensive treatment effect for:bushes and trees grass (C3) mode> orchard grass (C1) mode> Camellia (C2) mode. With bushes and trees and grass to the best, followed by fruit and grass tea modes. Among grass and fruit bushes and trees and grass for the best, and the difference is minimal.3. Soil carbon and nitrogen content:3 kinds of different vegetation restoration patterns compared to non-treatment area could significantly (CK) soil carbon and nitrogen content, thereby increasing soil nutrients, water and fertilizer to improve the internal situation, and promote vegetation to absorb nutrients better restore the ecological function. Soil carbon and nitrogen content of size:fruit grass (C1) mode> tree, shrub and grass (C3) mode> Camellia (C2) mode. Carbon and nitrogen content of the highest fruit and grass recover the best, followed by bushes and trees and grass, and finally the tea, fruit and grass where organic carbon (SOC) content in the other two modes of 1.10-fold and 1.90-fold; total N (TN) are the other two modes of 1.20-fold and 1.27-fold.4. DOC dissolved organic carbon content of the soil:three kinds of different vegetation restoration patterns compared to non-treatment area (CK),Could significantly increase the content of soil dissolved organic carbon DOC. Comprehensive two different extraction methods, soil dissolved organic carbon DOC content in the order:fruit grass (Cl) mode> tree, shrub and grass (C3) mode> Camellia (C2) mode. Among the best fruit grass recovery mode, followed by bushes and trees and grass, and finally the tea. Where higher dissolved organic carbon in soil fruit grass pattern (DOC) content compared to 27 percent of tree, shrub and grass between-70%, compared to between 52%-170% higher Camellia mode. Treatment effect compared to other modes, especially.5. MBC microbial biomass carbon content:three kinds of different vegetation restoration patterns compared to non-treatment area (CK), microbial biomass carbon MBC were significantly improved. On the vertical distribution, the smallest difference fruit grass, the largest tea. Cf different levels of MBC content size:fruit grass (C1) mode> Camellia (C2) mode> bushes and trees grass (C3) mode. Orchard grass in the best mode of governance, followed by tea tree, shrub and grass patterns and models. Which,20-40cm soil orchard grass model compared to the other two models, MBC improved content:62.53% and 91.09%. |
PDF Full Text Request