The customary roar of trucks and harvesting machines across vast softwood plantations astride the Victorian-South Australian border has turned to near silence. …As China ramps up its assault on Australian exports to include tariffs of up to 200 per cent on Australian wine this week, those who harvest the forests and the sea in south-west Victoria and south-east South Australia have been reeling for weeks. China’s recent trade bans on logs and crayfish are causing a crisis in Portland and what is known as the “green triangle” – a cross-border area rich in 340,000 hectares of plantation forests. No ships carrying softwood logs have sailed from Portland for more than two weeks, leaving tens of thousands of tonnes of logs stacked around the port and in danger of deteriorating to the point they won’t find a buyer. More than $70 million of plantation harvesting and haulage equipment is “parked up” for lack of work…