THE Country Parks Board has agreed to let China Light and Power run new power-transmission lines through country parkland. This follows the submission by China Light of an adapted cable alignment plan to minimise the impact on sensitive areas. China Light re-drafted the alignment after the World Wide Fund for Nature (WWF) complained that original proposals did not take into consideration ecological impacts, only the landscape. A consultant was appointed by the power company to study these impacts, using, in part, a new ecological map drawn up by the WWF. ''Obviously, it would have been better if they had done it earlier and it would have speeded up the project. But it's good and encouraging that China Light did this,'' said WWF executive director David Melville. The power lines will originate from the mammoth 6,000-megawatt electricity station - one of the biggest in the world - which is to be built at Black Point by 1996. In announcing its decision yesterday, the Country Parks Board noted that the visual impact in country parks would not be serious and that the alignment had changed to avoid two sites of special scientific interest at Ho Chung and Ng Tung Chai. The board said it was accepting China Light's proposal in principle, provided any disturbance to the landscape was restored and there was minimum disturbance to the environment, based on the advice of the Agriculture and Fisheries Department (AFD). It also endorsed an AFD plan to extend Tai Lam Country Park by 37 hectares, to include Tai Tong near Yuen Long. The area had previously been dug up to provide sand for reclamation work, but had been re-planted with acacia, eucalyptus, casuarina, pinus elliotii and other tree species, commonly found in country parks. The AFD has also developed the area for recreation by setting up barbecue sites, games areas, a tree walk, viewing points, toilets and shelters. Mr Melville said any extension to country parkland was good, but he was concerned that no native tree species were among those planted in the area. He also hoped the extension was not intended as a trade-off for developing parts of other parks for purposes other than parkland, such as housing or golf courses.