[Soil phosphorus forms and phosphorus solubilizing bacteria distribution after restoration from seriously burning in Greater Khingan Mountain areas, China].

To understand the contents of various phosphorus forms, phosphorus solubilizing bacte-rial community structure and the relationship between them in soils after restoration from the seriously burning, we collected soil samples from artificial restoration (Pinus sylvestris var. mongolica plantation, Larix gmelinii plantation), artificial accelerated natural restoration (secondary forest) and natural restoration (natural secondary forest) stands in Greater Khingan Mountain area. Using methods of Sui et al.

Soil greenhouse gases fluxes and the affecting factors of natural secondary forest from seriou-sly burned area in Greater Khingan Mountains, China.

To learn the intensity of greenhouse gases (GHG) fluxes source/sink from soil and the influence factors of a natural secondary forest from seriously burned area in Greater Khingan Mountains, we used static chamber-GC technique to measure soil GHG (CO, NO, CH) in situ during the growing season (from June to September). The results showed that: 1) The soil of natural secondary forest was atmospheric CO and NO source and CH sink. The mean fluxes of soil GHG (CO, NO, CH) during the growing season were 575.

[Monitoring and evaluation of the effects of Grain for Green Project in the upper and middle reaches of China's Yangtze River.].

Based on the comprehensive interpretation of GIS, we analyzed the normalized vegetation index (NDVI), land use types and digital elevation model (DEM), and revealed the results achieved by the Grain for Green Project in 84 prefecture-level regions in the middle and upper reaches of the Yangtze River. The results showed that the NDVI was growing in this area from 2000 to 2015. Compared with 2000, 2.

[Effects of root excision mulched with film on photosynthesis characteristics of poplar shelterbelts in black soil region].

Root excision mulched with film is an effective method which can minimize decrease in crop production in negative-effect area. However, the measure may have adverse effects on the cropland shelterbelt. Taking no treatment as CK, the effects of root excisions mulched with film at distance 0.

[Distribution characteristics of soil organic carbon of burned area under different restorations.].

The distribution characteristics of soil organic carbon (SOC), soil dissolved organic carbon (DOC) and soil microbial biomass carbon (MBC) under different restorations were studied in Larix gmelinii plantation, Pinus sylvestris var. mongolica plantation, artificial promotion poplar-birch forest and the natural secondary poplar-birch forest restored from burned area after the severe fire of Greater Xing' an Mountains in 1987. The results showed that the variations in SOC, DOC and MBC ranged from 9.

[Difference between carbon storage of burned area under different restorations in Greater Xing' an Mountains, Northeast China].

In order to explore forest restoration approach effect on carbon storage of severely burned area in Greater Xing'an Mountains, the carbon contents of tree, shrub, herb and litter from two plantations (Larix gmelinii and Pinus sylvestris var. mongolica) and natural secondary forest were determined, respectively, by using dry combustion method. The biomass of each component was obtained to estimate the distribution characterization of forest vegetation carbon storage by combing whole harvest method with average standard wood method.

[Population structure and understory species diversity of different aged Pinus sylvestris var. mongolica plantations in Nenjiang Sandy Land of Northeast China].

Taking the Pinus sylvestris var. mongolica sand-fixing plantations at different development stages (24-, 29-, 39-, and 43 years old) in Nenjiang Sandy Land as test objects, this paper studied their population structure, understory species composition, and species diversity. No regenerated seedlings were found in all the four P.

[Responses of soil structure to seasonal freezing-thawing in a typical black soil cultivated region].

Taking the soil in a typical black soil cultivated region as test object, this paper analyzed its aggregate size distribution, wedge resistance, bulk density, porosity, saturation degree, and generalized structure index after a seasonal freezing-thawing cycle, and evaluated the effects of the freezing-thawing cycle on the soil structural characters. The seasonal freezing-thawing cycle aggravated the disruption of air-dried aggregates, but strengthened the aggregation of water-stable aggregates and lowered their destruction rate. After the freezing-thawing cycle, soil wedge resistance decreased by 15.

[Effects of salt stress on mulberry seedlings growth, leaf water status, and ion distribution in various organs].

Taking the seedlings of mulberry (Morus alba) varieties Qiuyu and Tailai from Heilongjiang Province as test materials, this paper studied their growth, leaf water relations, and ion distribution in various organs under the stress of different salt concentration. The resu1ts showed that salt stress decreased the plant height and dry mass of the seedlings obviously, and the dry mass of young leaves was more affected than that of old leaves. With increasing salt stress, leaf water potential, osmotic potential, pressure potential, and relative water content decreased markedly, while the Na+ concentration in root and stem had an obvious increase.