A 10-year study on techniques for vegetation restoration in a desertified salt lake area.

A 10-year study on techniques for vegetation restoration in a desertified salt lake area.
Gao, Yong; Qiu, Guo Yu; Shimizu, Hideyuki
S.l. : s.n., n.d
Journal of arid environments. jrg. 2002, 52. p. 483-497
Samenvatting:Vegetation restoration is one of the most common and effective ways tocombat desertification and prevent adjacent areas from sand encroachmentin many of the desertified regions of the world. However, vegetationrestoration in desertified regions is very difficult because of lowrainfall, the mobile ground surface, and cost. An effective, low-costmethod of afforestation is urgently required. To determine such a method,a 10-year study was carried out in the Jilantai Salt Lake area. Fivedifferent afforestation areas were established: a `comparison area,' a`land enclosure area,' a `land enclosure + irrigation area,' a`leveled-afforestation area' (the dune areas were leveled and thenplanted with seedlings with added irrigation), and a `protectedafforestation area' (the dune areas were planted with seedlings, and thesurviving natural vegetation was protected as much as possible).Vegetation-related parameters (survival rate, height, trunk diameter,coverage, canopy size, and density) and environment-related factors(relative humidity, wind velocity, and amount of sand encroachment) weremeasured by standard methods. Results show that the protectedafforestation method had the following advantages: (1) the survival ratewas higher for seedlings planted in the protected afforestation area thanin the leveled afforestation area; (2) vigor (height, trunk diameter,coverage, and canopy size) was better in seedlings planted in theprotected afforestation area than in the leveled afforestation area,especially in the beginning period of revegetation; (3) coverage (ofindividual species, of all planted vegetation, and of all vegetation) waslarger in the protected afforestation area than in the leveledafforestation area; (4) density of naturally germinated plant species washigher in the protected afforestation area than in the other areas,showing that the protected afforestation method provided a suitablegrowing environment not only for planted species but also for naturallygro