| In arid and semi arid region, the climate was drought, the precipitation was scarce and the ecological environment was weak. Water shortage is the main factor restricting the region's economic development and ecological improvement. Ridge-furrow collecting rainwater planting is important for exploring the potential of rainwater resourse, promoting ecological environment improvement and developing agriculture and animal husbandry based on rainwater-collected in arid and semi-arid region. In order to resolve the restriction of deficient ground water, rare precipitation, and uneven distribution among growing season on forage growth and development, ridge-furrow collecting water planting system, composed of mulched ridge served as runoff collected zone and furrow served as planting zone, was utilized in semi-arid region. It gathered limited rainwater within the planting zone, improved the soil moisture and enhanced the total forage yield (MR60 refers to the width of ridge and furrow is 60cm and 30cm; MR30 refers to the width of ridge and furrow is 30cm and 30cm; CK refers to flat planting). Through examine the soil water transportation and indexes of Elymus (Elymus sibirlcus L.) growth and development, the following are the preliminary results1. Ridge-furrow collecting water planting system improved the soil moisture between soil layer of 0-50 cm. In non-growing season from autumn to next spring, it enhanced the soil water storage and retention in planting zone. In growing season, soil moisture content formerly increased and later decreased with the soil layer deepened, with the same soil layer, the soil moisture content in MR60 was higher than that in MR30, and the MR30 was higher than that in CK. The rainfall gathered in the planting zone vertically infiltrated and lateral seeped to the ridge, wetting front growed deeper and broadened.2. Ridge-furrow collecting water planting system played vital part in vegetative growth of Elymus. The system significantly enhanced lent height, promoted tillering, increased density of Elymus, the number of leave, the length and width of Elymus increased to some degree. The density between treatments in 2008 didn't vary significantly, the density of MR60 and MR30 were about 3500 tiller/m2, while that of CK was 2300 tiller/m2, the density between MR60 and MR30 were improved relatively by 52%.3. Ridge-furrow collecting water planting system improved forage yield per unit area. The yield of MR60, MR30 and CK of first cutting in 2009 were separately 4.11t/hm2,3.86t/hm2 and 1.37t/hm2. The yield of MR60 was enhanced by 3 times with CK, and that of MR30 was enhanced by 2.8 times with CK. The yield of MR60, MR30 and CK of second cutting were 1.13t/hm2,1.01t/hm2and 0.25t/hm2. The yield of MR60 was improved by 4 times with CK, and that of MR30 was improved by 3.9 times with CK.4. Ridge-furrow collecting water planting system played important role in reproductive growth of Elymus. Firstly, the system, enhanced fertile tillers density, the average fertile tillers density of MR30, MR60 and CK were 576 tiller/m2,411 tiller/m2 and 284 tiller/m2. Secondly, the system increased spikelets per fertile, the average spikelets per fertile of MR60, MR30 and CK were 58,54 and 46. Thirdly, the system enhanced the lower and middle seeds number of spikelet, and it didn't matter for the upper seed number. In the lower part of inflorescence (1-10item), the seed number of spikelet of MR60, MR30 and CK were 3,2 and 1; In the middle of inflorescence (10-20 item), the seed number of spikelet of MR60, MR30 and CK were 3,3 and 2; In the upper part of inflorescence (＞20 item), the seed number between treatments was either 1 or 0. Fourthly, the system improved thousand seed weight of Elymus, the thousand seed weight of MR60, MR30 and CK were respectively 3.51,3.09 and 2.99g. Lastly, the system enhanced seed yield of Elymus, the seed yield of MR60, MR30 and CK were separately 1.11 t/hm2,0.82 t/hm2 and 0.44 t/hm2, the seed yield of MR60 and MR30 was 2.5 and 1.8 times higher than that of CK.
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