Research On The Ecological Profit Of Restoration In Eroded Red Soil

The red soil aera of upland in subtropical China is severely eroded.Although we have done much work on ecological restoration and regeneration, little done on appraising restoration and regeneration. By far,many measurement have been taken to restore the degenerated ecosystem,but we still don't know which measurement could be the best.In this study, we take severely soil eroded land(as a control ecosystem), ban forest (as the control I ecosystem after planting Pinus massoniana and baned) and a mixed forest of Cunninghamia Lanceolata plantation and Pinus massoniana (as the control II ecosystem after planting a mixed forest of Cunninghamia Lanceolata plantation and Pinus massoniana and taking engineering restoration measurement)for study. soil physical and chemical properties, biomass, nutrient content,soil fertility and biological diversity were studied in three sites. This information is important for further understanding the mechanism in soil restoring process .The results showed that:1. The soil physical structure and the soil chemical properties in two restoring measure ment are obviously improved. After taking the control II measurement, <0.002mm clay content in up soil profile(0²0cm) is 2.01 times as much as that of the control ecosystem. Soil organic matter in the control II is 2.70 times as much as that of the controlecosystem.and which is 1.44 times as much as that of the controlecosystem. Total N, total P, total K are higher in the control II and the control I ecosystems than the control ecosystem, and the sequence is that: control II > control I >the control. We come to a conclusion that both the two restoration measure could promote soil fertility.2. Biomass of the control II ecosystem is 107.61 t-hm^-2, which is 2.25 times as much as that of the control I ecosystem(47.88 t·hm^-2), and which is 9.16 times as much as that of the the control ecosystem. Tree layer biomass of the control II ecosystem is up to 83.86t·hm^-2 and that is 15.53t·hm^-2 in the control I ecosystem , which are 10.77times and 1.99 times as much as that of the control ecosystem,respectively; shrub layer biomass in the control II ecosystem , control I ecosystem and the control ecosystem are 6.90t·hm^-2, 8.00t·hm^-2, 0.69t·hm^-2, respectively;Herb layer biomass in the control II ecosystem , control I ecosystem and the control ecosystem are 1.60t·hm^-2, 12.52 t·hm^-2, 1.68 t·hm^-2, respectively; and shrub layer biomass in the control II ecosystem , control I ecosystem and the control ecosystem are 6.90t·hm^-2, 8.00t·hm^-2, 0.69t·hm^-2,respectively; litter layer biomass in the control II ecosystem , control I ecosystem and the control ecosystem are 15.25t·hm^-2, 11.83 t·hm^-2, 1.59t·hm^-2 , respectively, and the...