Entity

Time filter

Source Type


Niu C.-Y.,CAS Shenyang Institute of Applied Ecology | Niu C.-Y.,University of Chinese Academy of Sciences | Alamusa,CAS Shenyang Institute of Applied Ecology | Zong Q.,University of Chinese Academy of Sciences | And 4 more authors.
Chinese Journal of Ecology | Year: 2013

Taking the 4- and 18-year-old artificial plantations and the natural stand of Caragana microphylla in Horqin Sandy Land as the objects, and through digging root system by layers, this paper investigated the features of C. microphylla root distribution in different vegetation zones, and studied the responses of C. microphylla in its biomass allocation, root/ shoot ratio, and root distribution to dry environment. The C. microphylla tended to allocate more biomass to roots. Among the three vegetation zones, natural stand and 4 years old artificial plantation had the largest and the smallest proportion of below-ground biomass, respectively. The root biomass decreased gradually with soil depth, and the roots were mainly distributed in the 0-100 cm soil layer. The biomass of the absorptive roots of 4 years old C. microphylla plantation was more distributed in surface soil layer, being significantly greater than that of 18 years old plantation and natural stand (P<0.05) in 0-50 cm soil layer. However, the 18 years old plantation and the natural stand had more absorptive root biomass in 50-100 cm soil layer. The conductive root biomass of natural stand in 50-100 cm soil layer was significantly greater than that of 4- and 18-year-old plantations. The relationships between the above- and below-ground biomass allocations of C. microphylla were characterized by allometry model. Source


Zong Q.,CAS Shenyang Institute of Applied Ecology | Zong Q.,University of Chinese Academy of Sciences | A L.,CAS Shenyang Institute of Applied Ecology | Luo Y.-M.,CAS Shenyang Institute of Applied Ecology | And 3 more authors.
Chinese Journal of Applied Ecology | Year: 2012

An observation was conducted on the thickness of dry sand layer on the windward slope of mobile and fixed dunes in west Horqin Sand Land, with the spatial distribution of the dry sand layer analyzed. Most of the dry sand layer had a thickness of 5-15 cm, and 92.0% and 98.6% of the mobile and fixed dunes had the dry sand layer with this thickness, respectively. Sand-fixing plants affected the thickness and the spatial distribution of the dry sand layer. There was an obvious spatial difference in the thickness of the dry sand layer on mobile dunes, being much thicker in the upper west areas while much thinner in the lower east areas. The thickness of the dry sand layer varied from 0 to 40 cm, with an average of 9.58±3.95 cm, and the CV was 41%. The variogram of the spatial distribution of dry sand layer on mobile dunes was expressed as spherical model, with a moderate spatial correlation. In contrast, the thickness of dry sand layer on fixed dunes showed obvious homogeneity, and had less spatial difference. The thickness of the dry sand layer ranged from 0 to 20 cm, with an average of 10.91±1.70 cm, and the CV was only 16%. Source

Discover hidden collaborations