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| 1 | Nitrogen Losses from Flooded Rice Field显示文摘A field microplot experiment was conducted during the tillering stage of paddy rice to investigate nitrogen(N) Iosses from flooded rice fields following fertilizer application. After application of ammonium bicarbonate,most of nitrogen in the floodwater was present as NH4-N and its concentration varied widely with time.Concentrations of both NO3-N and NO2-N in the floodwater were low due to the weakened nitrification.Under flooded anaerobic reducing conditions, soil solution concentrations of NO3-N and NH4-N were nothigh, ranging from 0.6 mg L-1 to 4.8 mg L-1, and decreased with soil depth. However, the groundwater wasstill contaminated with NO3-N and NH4-N. Rainfall simulation tests showed that the N losses via runoff inrice fields were closely related to the time intervals between fertilizer applications and rainfall events. Whena large rain fell for a short period after fertilizer application, the N losses via runoff could be large, whichcould have a considerable effect on | GAOXIAOJIANG HUXUEFENG 等 | 2002 | Pedosphere2002，12，2： | 42 |
| 2 | Do multiple cycles of aeolian deposit-pedogenesis exist in the reticulate red clay sections in southern China?显示文摘The Xiangyang reticulate red clay section was newly sampled in high-resolution. The viewpoints different from the previous studies[1-7] are put forward after studying Munsell color values, weathering degrees, magnetic parameters and stable carbon isotopic compositions of the section. They are as follows: (1) The curves of hue, DCB extracted iron (Fed), DCB extracted iron/total iron ratio (Fed/Fet), weathering index (BA) of the section show that the redness is not significantly correlated with the weathering degree of the layers though the uppermost yellow-brown-colored layer is relatively weakly weathered. The variation in hues of the section is possibly attributed to the change of hematite and goethite contents. It is insufficient to determine the existence of the multiple deposit-pedogenesis cycles in the section, like the loess-paleosol sequence in Chinese Loess Plateau, only by the color variation. (2) Magnetic susceptibility (?) values in the non-reticulate and weakly reticulate layers are high; but are quite low in the reticulate red clay layer. The former are more than ten times higher than the latter because of the leaching and collapse of superparamagnetic (SP) and stable single domain (SSD) magnetic particles during the plinthitic processes. Hence, ? values in the section are not controlled by weathering and pedogenic processes, and no longer have clear paleoclimatic implication. It is not correct to prove the existence of the multiple deposit-pedogenesis cycles in the section using ? curves. (3) The organic ??13C curve of the section illustrates the reduction of forests and increasing of C4 plants in the study area since the late stage of the Quaternary period. It could not prove the existence of the multiple deposit-pedogenesis cycles in the section either. (4) As a matter of fact, it is difficult to prove the existence of the multiple deposit-pedogenesis cycles in the Xiangyang section like the loess-paleosol sequence in Chinese Loess Plateau using the evidence available currently. | HUXuefeng CHENGTianfan WUHexin | 2003 | Chinese Science Bulletin2003，48，2： | 12 |
| 3 | Preliminary Study on Nitrogen and Phosphorus Releases from Creek Sediments in Shanghai Suburbs显示文摘A laboratory study was conducted to observe the release of nitrogen and phosphorus from the sedimentsunder both anaerobic and aerobic conditions. The samples used were five creek sediments and a fish-pondsediment (as a comparison) obtained from suburban Shanghai. High loads of nitrogen and phosphoruswere found in the creek sediments. Total nitrogen of the sediments ranged from 1.17 to 5.95 g kg-1; totalphosphorus from 608.63 to 2 033.95 mg kg-1. Making up more than 90% of the total nitrogen, organicnitrogen was the dominant nitrogen fraction in the sediments; whereas inorganic phosphorus was the dominantphosphorus fraction, which made up more than 85 percent of the total phosphorus. Cabound phosphorusfraction dominated inorganic phosphorus, which occupied more than 50% of the total.A large amount of ammonium was released from the sediments under both aerobic and anaerobic con-ditions, and the anaerobic releases were slightly greater than the aerobic. In addition, ammonium | HUXUEFENG GAOXIAOJIANG 等 | 2002 | Pedosphere2002，12，2： | 12 |
| 4 | Grain-size evidence for multiple origins of the reticulate red clay in southern China显示文摘Grain-size distributions of the reticulate red clay in Xuancheng, Anhui Province, and Jiujiang, Taihe and Ganzhou, Jiangxi Province, are analyzed. The results are as follows: (1) Generally fine and uniform, grain-size charac- teristics of the reticulate red clay in Xuancheng and Jiujiang are much similar, with no >2 mm gravels, 0.30% and 1.14% of >63 μm fraction on average, respectively, and 34.65% and 37.20% of 10―50 μm fraction, which is apparently accumu- lated. The patterns of the grain-size distribution curves of the uppermost yellow-brown earth of the profiles in the two ar- eas much resemble those of the loess in northern China and the Xiashu loess in southeastern China, while the patterns of the other layers also apparently show some attributes inher- ited from the above. The grain-size distribution patterns of the quartz separated from the whole profiles in the areas are almost identical, which could also be compared with those of the loess and the Xiashu loess. All the features above reveal aeolian characteristics of the reticulated red clay in these two areas. (2) The reticulate red clay in Taihe and Ganzhou is much coarser than that in Xuancheng and Jiujiang, with high content of >63 μm fraction and relatively low content of 10―50 μm fraction. The variations in grain-size distribu- tions of the profiles are also observed. The grain-size distri- bution patterns of both the original samples and the quartz of the red clay could hardly be compared with those of the loess and the Xiashu loess. All the features above reveal their alluvial or diluvial origins. (3) The multiple origins of the reticulate red clay in the areas reflect the diversity and com- plexity of the Quaternary environment in southern China. The existence of the reticulate red clay with aeolian charac- teristics brings forth objective evidence for the occurrence of large-scale dust deposition in southern China during the Quaternary glacial periods. Further investigation and study on the regional distribution of this kind of the red clay will be conducive to revealing the southern border of the large-scale dust deposition in southern China during the Quaternary glacial periods. | HUXuefeng ZHUYu SHENMingneng | 2005 | Chinese Science Bulletin2005，50，9： | 10 |
| 5 | Origin of Quaternary Red Clay of Southern Anhui Province显示文摘QuaternaryredclaywithadepthofseveralmetresormoreiswidelydistributedinsouthernChina.Itisanimportantsoilformingparentmaterial... | HUXUEFENG YUANGUODONG 等 | 1998 | Pedosphere1998，8，3： | 9 |
| 6 | Preliminary Study on Relationship Between Soil Parent Materials and Tea Quality显示文摘Six tea plantations with different soil-forming parent materials, the same tea variety and tea age and similar landforms and management were selected to conduct a systematic study on the relationship between soil properties and tea quality. The results showed that the quality of tea grown on the soils derived from granites, arenaceous shales, argillaceous sandstones, was superior; those on the soils derived from limestones,dolomites, Quaternary red clays, were inferior. Further study showed that sandy soils were beneficial to improving amino acid content of tea, and clayey soils made it decrease; high content of bases might decrease the contents of tea polypenols, caffeine, water extracts, but promote the content of amino acids; available phosphorous was significantly positively correlated with water extracts, but significantly negatively correlated with carbine; slowly available potassium was positively correlated with amino acid content. Soil parent materials should be regarded as an important factor in evaluating the adaptability of tea to soils. | WANGXIAOJU HUXUEFENG 等 | 1997 | Pedosphere1997，7，4： | 3 |
| 7 | Some Biogeochemical Characteristics of Tea Soils显示文摘Characteristics of the element abundance, material cycling, element budget in tea soils were discussed based on investigations of six tea plantations and the adjacent waste lands in the Three Gorges region.The plantations have different soil-forming parent materials, but similar landforms, and the same tea variety and close ages. The results showed that tea growing could increased the contents of organic matter,total and available N, P, Al and Mn; the elements enriched by tea trees were in the following descending Sequence: P > Ca> K > Mn > Mg > Zn > Al > Fe; elements returned through litter of tea were in the sequence of Ca> Mn > P > Zn > Mg > K > Al > Fe; in the nutrient budget of the soil-tea system, P and K were in deficit,whereas Al, Ca, Fe and Mn in surplus. | WANGXIAOJU HUXUEFENG 等 | 1997 | Pedosphere1997，7，3： | 0 |
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